-
You should spend about 20 minutes on this
task.
The two graphs show the main
sources of energy in the USA in the 1980s and the
1990s.
Write a report for a
university lecturer describing the changes which
occurred.
Write at least 150
words.
model answer:
The two graphs show that oil was the
major energy source in the USA in both 1980 and
1990
and that coal, natural gas and
hydroelectric power remained in much the same
proportions.
On the other hand, there
was a dramatic rise in nuclear power, which
doubled its percentage
over the ten
years.
Oil supplied the
largest percentage of energy, although the
percentage decreased from 42% in
1980
to 33% in 1990. Coal in 1990 was the second
largest source of energy, increasing its
proportion to 27% from 22% in the
previous decade. Natural gas, the second largest
source in
1980 at 26%, decreased its
share very slightly to provide 25% of America’s
energy ten years
later.
There
was
no
change
in
the
percentage
supplied
by
hydroelectric
power
which
remained at 5% of the total energy
used. Nuclear power the greatest change: in 1990
it was
10%, twice that of the 1980s.
You should spend about 20 minutes on
this task.
The graph below shows the
differences in wheat exports over three different
areas.
Write a report for a
university lecturer describing the information
shown below.
Write at least
150 words.
model answer:
The three graphs of wheat exports each
show a quite different pattern between 1985 and
1990.
Exports
from
Australia
declined
over
the
five-
year
period,
while
the
Canadian
market
fluctuated
considerably,
and
the
European
Community
showed
an
increase.
In 1985, Australia exported about 15
millions of tonnes of wheat and the following year
the
number
increased
by
one
million
tonnes
to
16
million.
After
that,
however,
there
was
a
gradual decline until 1989 and 1990
when it stabilised at about 11 million tonnes.
Over the
same period, the amount of
Canadian exports varied greatly. It started at 19
million tonnes in
1985,
reached
a
peak
in
1988
of
24
million,
dropped
dramatically
in
1989
to
14
million
tonnes
and then climbed back to 19 million in 1990.
Seventeen million tonnes were exported
from the European Community in 1985,
but this decreased to 14 million tonnes in 1986
and
then rose to 15 million in 1987 and
1988 before increasing once more to 20 million in
1990.
You
should spend about 20 minutes on this task.
The flowchart illustrates the
production of coloured plastic paper clips in a
small factory.
Write a
report for a university tutor describing the
production process.
Write at
least 150 words.
There are
four main stages in the production of plastic
paper clips from this small factory.
Two
of
these
stages
involve
actual
preparation
of
the
clips,
while
the
other
two
consist
of
quality control before the clips are
sent out from the factory to the retailers to be
sold to the
public.
To begin with, molten plastic is poured
into three different moulds depending on the
colour
required; the colours are red,
blue and
yellow. Once these clips
emerge from the moulds a
quality
control
machine
checks
them
for
strength.
Unsatisfactory
clips
are
rejected.
In
the
third
stage
in
the
process
the
clips
are
stored
by
hand
into
two
groups,
mixed
and
single
colours. When this stage is complete
the groups are checked a second time to ensure
that the
colour mixtures are divided
correctly into single colours and mixed colour
batches. Finally,
the clips are packed
and dispatched to the markets.
You should spend about 20 minutes on
this task.
The table below give
information about Favorite Pastimes in different
countries.
Summarise the
information by selecting and reporting the main
features, and make comparisons where
relevant.
Write at least 150
words.
Canada
France
England
Australia
Korea
China
USA
Japan
TV
60
/
/
65
22
15
60
/
Sport
22
/
/
30
21
25
23
/
From 30 - 50 years old
Reading
Hobbies
15
30
30
15
60
60
15
62
40
20
21
45
45
50
42
/
Music
3
4
4
5
2
0
23
/
Beach
0
/
/
30
2
5
30
/
Sleep
2
/
20
4
4
5
2
/
model answer:
This table clearly presents and
compares favorable pastimes in eight different
countries. The
pastimes, across the top
of the table, are analyzed in relation to each
country.
As can be seen,
about 60% of Canadians, Australians and Americans
like watching television.
On the other
hand, this figure is quite low for China where
only 15% of people watch
television.
Predictably, Americans like music at 23%, whereas
only 2 to 5% of people in the
other
countries feel the same way. 20% of people in
England enjoy sleeping as a pastime
whereas in Canada and the USA, for
example, the figure is only 2%. Interestingly, the
Chinese like hobbies the most at 50%,
as opposed to only 20% in France. It isn’t
surprising
that the highest percentage
of beach-lovers is in Australia and the USA at
30%.
It seems that pastimes
of people of different nationalities may be
influenced by a number of
factors such
as the socio-economic situation or the climate.
These factors influence cultural
differences between different
nationalities and make cross-cultural experiences
more
interesting.
You should spend about 20
minutes on this task.
Write a report
for a university lecturer describing the
information shown below.
You
should write at least 150 words.
model answer:
In this
analysis we will examine three pie charts. The
first o
ne is headed ‘World Spending.’
The second is ‘World Population’ and
the third is ‘Consumption of
Resources.’
In
the first chart we can see that people spend most
of their income (24%) on food. In some
countries this percentage would
obviously be much higher. Transport and then
housing are
the next major expenses at
18% and 12% respectively. Only 6% of income is
spent on
clothing.
In the second chart entitled ‘World
Population’, it is not surprising to find that 57%
of people
live in Asia. In fact China
and India are two of the most populated countries
in the world and
they are both situated
on this continent. Europe and the Americans
account for nearly 30% of
the total,
whilst 10% of people live in Africa.
Finally, the third chart reveals that
the USA and
Europe consume a huge 60%
of the world’s
resource.
To sum up, the major expenditure is on
food, the population figures are the highest for
Asia
and the major consumers are the
USA and Europe.
You should spend about
20 minutes on this task.
The graph and
table below give information about water use
worldwide and water consumption in two different
countries.
Summarise the information by selecting
and reporting the main features, and make
comparisons where relevant.
Write at least 150 words.
Country
Brazil
Democratic
Republic
of Congo
Population
176
million
Irrigated land
26,500 km?
Water
consumption per person
359
m?
5.2 million
100 km?
8
m?
model answer:
The graph shows how the amount of water
used worldwide changed between 1900 and 2000.
Throughout the century, the
largest quantity of water was used for
agricultural Purposes, and
this
increased dramatically from about 500
km?
to around 3,000 km?
in
the year 2000. Water
used in the
industrial and domestic sectors also increased,
but consumption was minimal until
mid-
century. From 1950 onwards, industrial use grew
steadily to just over 1,000 km?
, while
domestic use rose more slowly to only
300 km?
, both far below the levels of
consumption by
agriculture.
The table illustrates the differences
in agriculture consumption in some areas of the
world by
contrasting the amount of
irrigated land in Brazil (26,500 km?
)
with that in the D.R.C. (100
km?
). This means that a huge
amount of water is used in agriculture in Brazil,
and this is
reflected in the figures
for water consumption per person: 359
m?
compared with only 8 m?
in
the Congo. With a population of 176
million, the figures for Brazil indicate how high
agriculture water consumption can be in
some countries.
You should spend about
20 minutes on this task.
The diagram
below shows how a central heating system in a
house works.
Summarise the
information by selecting and reporting the main
features, and make comparisons where
relevant.
You should write
at least 150 words.
model
answer:
This diagram provides an
overview of a domestic central heating system. It
shows how the
tank, boiler and pipes
ensure a constant flow of hot waterto both the
radiators and the taps.
The
cold water enters the house and is stored in a
water storage tank in the roof. From there
ü
flows down to the boiler,
located on the ground floor of the house.
The boiler, which is
fuelled by gas or oil, heats up the water as it
passes through it. The hot
water is
then pumped round the house through a system of
pipes and flows into the radiators,
located in different rooms. The water
circulates through the radiators, which have small
tubes
inside them to help distribute
the heat, and this warms each of the rooms. Some
of the water
is directed to the taps to
provide hot water for the house.
Once the water has been through the
pipes and radiators, it is returned to the boiler
to be re-
heated and circulated round
the house again.
You should spend about
20 minutes on this task.
The graph
below gives information about the preferred
leisure activities of Australian children.
Write a report for a
university lecturer describing the information
shown.
You should write at
least 150 words.
model
answer:
The graph shows the preferred
leisure sctivities of Australian children aged
5-14. As might be
expected, it is clear
from the data that sedentary pursuits are far more
popular nowadays than
active ones.
Of the 10,000 children that
were interviewed, all the boys and girls stated
that they enjoyed
watching TV or videos
in their spare time. In addition, the second most
popular activity,
attracting 80% of
boys and 60% of girls, was playing electronic or
computer games. While
girls rated
activities such as art and craft highly
–
just under 60% stated that
they enjoyed
these in their spare time
–
only 35% of boys opted for
creative pastimes. Bike riding, on the
other hand, was almost as popular as
electronic games amongst boys and, perhaps
surprisingly, almost 60% of girls said
that they enjoyed this too. Skateboarding was
relatively
less popular amongst both
boys and girls, although it still attracted 35% of
boys and 25% of
girls.
You should
spend about 20 minutes on this task.
The table below provide information on
rental charges and salaries in three areas of
London.
Write a report for
a university lecturer describing the information
shown below.
You should
write at least 150 words.
Weekly rents
per property
(?
/w)
1 bed
375
325
215
Area
Notting Hill
Regent's
Park
Fulham
Salaries needed
(?
/year)
1
bed
2 bed
3 bed
2
bed
485
450
390
3 bed
738
650
600
98,500
127,500
194,000
85,500
118,000
170,500
56,500
102,500
157,500
model answer:
The table shows two sets of related
information: the relative cost, in pounds, of
renting a
property with one, two or
three bedrooms in three different suburbs of
London and an
indication of the kind of
annual salary you would need to be earning to rent
in these areas.
Of the
three areas mentioned, Notting Hill is the most
expensive with weekly rents starting at
?
375 (salary approximately f
100,000) and rising to ?
738 per week
for a 3-bedroom property.
To afford
this, you would require a salary in the region of
?
200,000 per annum. Alternatively,
Fulham is the cheapest area shown with
rents ranging from ?
215 per week for a
one bedroom
property to ?
600
per week for a 3-bedroom property. To rent in this
area, salaries need to be
somewhere
between ?
85,000 and ?
170,000
depending on the number of bedrooms required.
For those able to pay in the middle
price range for accommodation, Regent's Park might
be a
more suitable district.
You should
spend about 20 minutes on this task.
The diagrams below give information
about the Eiffel Tower in Paris and an outline
project to extend it underground.
Write a report for a university
lecturer describing the information
shown.
You should write at
least 150 words.
model answer:
The Eiffel
Tower is situated close to the Seine River in
Paris. It is a metal
structure that is
1,063 feet high and weighs 7,417 tonnes. The tower
has
been a tourist attraction since
1889, when it was built, and there are 1,665
steps that can be climbed in order to
reach the two viewing platforms.
There are now plans to build below the
foundations of the tower. These
plans
include the development of five underground levels
that will
incorporate the tower's
ticket office, shopping facilities, a cinema and
museum and two floors of underground
parking.
Although details
have yet to be finalised, the principle is that
the five
floors will be connected by
two vertical passenger lifts on either side of the
tower. In addition, the floor
immediately below the tower, which is
planned to house the ticket office,
will also consist of a large atrium with a
glass ceiling so that visitors can look
directly up at the tower itself.
You should spend about 20
minutes on this task.
The diagram below
gives the information about the Hawaiian island
chain in the centre of the Pacific Ocean.
Write a report for a
university lecturer describing the information
shown.
You should write at
least 150 words.
model
answer:
The Hawaiian island chain, in
the centre of the Pacific Ocean, is approximately
2,700 km in
length. It is formed of
volcanoes and the active ones are at the south-
east tip of the
archipelago, where
Hawaii itself is located.
It is believed that the chain began to
form nearly 80 million years ago. Each island
started to
evolve after an eruption on
the sea floor. First, a `hot spot' existed on the
ocean bed, which let
out a plume of
material called magma. This magma may originate as
deep as 2,883km below
the ocean bed.
Next, further eruptions took place, which built up
the volcano. Eventually, it
emerged
above the surface of the ocean.
Since that time, the spume of magma has
remained static as the Pacific tectonic plate
moves
in a north-west direction across
it at a speed of 7-9cm per year. As it moves, a
volcano forms
as it passes over the
hotspot and then become inactive when it has
passed it.
You
should spend about 20 minutes on this task.
The bar chart below shows the results
of a survey conducted by a personnel department at
a major company. The
survey was carried
out on two groups of workers: those aged from
18-30 and those aged 45-60, and shows factors
affecting their work performance.
Write a report for a
university lecturer describing the information
shown below.
You should
write at least 150 words.
The bar chart indicates a survey on two
different age groups on the factors contributing
to
make their environment pleasant for
working.
These factors are
divided into external and internal factors. The
internal factors are team
spirit,
competent boss, respect from colleagues and job
satisfaction. The external factors are
chance for personal development, job
security, promotional prospects and money.
On the internal factors
above 50% in both age groups agreed that team
spirit, competent boss
and job
satisfaction are essential to make their
environment pleasant. Whereas on the external
factors, there are contrasting results.
On the chance for personal development and
promotional aspects, 80% to 90% of the
younger groups were in favor while only less than
50% of the older group thought so. A
similar pattern is also noted on job security.
With
regards to money, 69% to 70% on
both age group said it is essential.
In conclusion, the internal factors
have similar responses from the two age groups
while they
had dissimilar responses on
the external factors.
You should spend
about 20 minutes on this task.
The
table below shows the proportion of different
categories of families living in poverty in
Australia in 1999.
Summarise the information by selecting
and reporting the main features, and make
comparisons where relevant.
You should write at least 150 words.
Give reasons for your
answer and include any relevant examples from your
own knowledge or experience.
Family
type
Proportion of people
from each
household type living in
poverty
single aged
person
aged
couple
single, no
children
couple,
no
children
sole
parent
couple with
children
all
households
6% (54,000)
4% (48,000)
19% (359,000)
7%
(211,000)
21% (232,000)
12% (933,000)
11% (1,837,000)
model answer:
The table
gives a breakdown of the different type of family
who were living in poverty in
Australia
in 1999.
On average, 11% of
all households, comprising almost two million
people, were in this
position. However,
those consisting of only one parent or a single
adult had almost doubt this
proportion
of poor people, with 21% and 19% respectively.
Couples generally tended to
be better off, with lower poverty levels for
couples without
children (7%) than
those with children (12%). It is noticeable that
for both types of household
with
children, a higher than average proportion were
living in poverty at this time.
Older people were generally less likely
to be poor, though once again the trend favoured
eldery couples (only 4%) rather than
single eldery people (6%).
Overall the
table suggests that households of single adults
and those with children were more
likely to be living in poverty than
those consisting of couples.
You should
spend about 20 minutes on this task.
The take below gives information about
the underground railway systems in six cities.
Summarise the information
by selecting and reporting the main features, and
make comparisons where relevant.
You should write at least 150 words.
Underground Railways Systems
City
London
Paris
Tokyo
Washington
DC
Kyoto
Los Angeles
Date
opened
1863
1900
1927
1976
1981
2001
Kilometres of
route
394
199
155
126
11
28
Passengers
per
year
(in
millions)
775
1191
1927
144
45
50
model
answer:
The table shows the details
regarding the underground railway systems in six
cities.
London has the
oldest underground railway systems among the six
cities. It was opened in the
year 1863,
and it is already lye years old. Paris is the
second oldest, in which it was opened in
the year 1900. This was then followed
by the opening of the railway systems in Tokyo,
Washington DC and Kyoto. Los Angeles
has the newest underground railway system, and
was only opened in the year 2001. In
terms of the size of the railway systems, London,
For
certain, has the largest
underground railway systems. It has 394 kilometres
of route in total,
which is nearly
twice as large as the system in Paris. Kyoto, in
contrast, has the smallest
system. It
only has 11 kilometres of route, which is more
than 30 times less than that of
London.
Interestingly, Tokyo, which
only has 155 kilometres of route, serves the
greatest number of
passengers per year,
at 1927 million passengers. The system in Paris
has the second greatest
number of
passengers, at 1191 million passengers per year.
The smallest underground railway
system, Kyoto, serves the smallest
number of passengers per year as predicted.
In conclusion, the
underground railway systems in different cities
vary a lot in the site of the
system,
the number of passengers served per year and in
the age of the system.
You should spend about 20 minutes on
this task.
The charts below show the
percentage of their food budget the average family
spent on restaurant meals in different
years. The graph shows the number of
meals eaten in fast food restaurants and sit-down
restaurants.
You should
write at least 150 words.
Give reasons for your answer and
include any relevant examples from your own
knowledge or experience.
Over the past 30 years, the average
family has dramatically increased the number of
meals
that they eat at restaurants. The
percentage of the family's food budget spent on
restaurant
meals steadily climbed. Just
10 percent of the food budget was spent on
restaurant meals in
1970, and 15
percent in 1980. That percentage more than doubled
in 1990, to 35 percent, and
rose again
in 2000 to 50 percent.
Where families eat their restaurant
meals also changed during that 30-year period. In
1970,
families ate the same number of
meals at fast food and sit-down restaurants. In
1980,
fam?
ilies ate slightly
more frequently at sit-down restaurants. However,
since 1990, fast food
restaurants serve
more meals to the families than do the sit-down
restaurants. Most of the
restaurant
meals from 2000 were eaten at fast food
restaurants. If this pattern continues,
eventually the number of meals that
families eat at fast food restaurants could double
the
number of meals they eat at sit-
down restaurants.
You should spend
about 20 minutes on this task.
The map
below is of the town of Garlsdon. A new
supermarket (S) is planned for the town. The map
shows two
possible sites for the
supermarket.
Summarise the
information by selecting and reporting the main
features, and make comparisons where
relevant.
You should write
at least 150 words.
Give
reasons for your answer and include any relevant
examples from your own knowledge or experience.
The first
potential location (S1) is outside the town
itself, and is sited just off the main road to
the town of Hindon, lying 12 kms to the
north-west. This site is in the countryside and so
would be able to accommodate a lot of
car parking. This would make it accessable to
shoppers from both Hindon and Garlsdon
who could travel by car. As it is also close to
the
railway line linking the who towns
to Cransdon (25 km to the south-east), a
potentially large
number of shoppers
would also be able to travel by train.
In contrast, the suggested location,
S2, is right in the town centre, which would be
good for
local residents. Theorically
the store could be accessed by road or rail from
the surrounding
towns, including
Bransdon, but as the central area is a no-traffic
zone, cars would be unable
to park and
access would be difficult.
Overall, neither site is appropriate
for all the towns, but for customers in Cransdon,
Hindon
and Garlsdon, the out-of-town
site (S1) would probably offer more advantages.
The table below shows CO2
emissions for different forms of transport in the
European Union.
The Pie
Chart shows the percentage of European Union funds
being spent on different forms of
transport.
You should write
at least 150 words.
Give
reasons for your answer and include any relevant
examples from your own knowledge or experience.
The
chart shows CO2 emissions per passenger kilometre
for variuos methods of transport in the
European Union while the pie chart
shows European Union spending on transport. Flying
by air
produces by far the greatest CO2
emissions, approximately three times as much as
passenger cars
which are the next
largest producers. Very little is spent by the EU
on air travel while roads make up
more
than half of the EU transport budget.
Trains produce about three times less
CO2 emissions per passenger kilometre than
passenger cars and
eight times less
than air travel. Nearly a third of EU transport
funds are spent on railways.
Ships are a clean form of transport and
produce about the same amount of CO2 per passenger
kilometre as trains do. However, only 2
percent of EU funds are spent on ports. A further
one percent
is spent on inland
waterways.
Coaches are the
cleanest form of transport. Emissions of CO2 per
passenger kilometre from coaches
are
half those of buses. Buses emit less than half as
much CO2 per passenger kilometre as cars. The
European Union spends 10 percent of its
transport budget on public transport, such as
buses and
coaches.
The table
below shows the sales at a small restaurant in a
downtown business district.
Summarize the information by selecting
and reporting the main features, and make
comparisons where relevant.
.
Fulfilling the Work Experience
Requirement
Credits will be awarded
when the final report is submitted.
Application
Choose potential
workplaces from approved list and arrange
interviews. Submit applications to
places of interest.
Approval
When acceptance letter is received,
submit it
to professor for approval.
Schedule
Arrange schedule to
work a minimum of 10
hours/ week over
20 weeks.
Reports
Complete
weekly Report Form and submit to
professor every Friday.
Evaluation
During final
workweek, participate in evaluation meeting with
work
supervisor. Supervisor submits
Evaluation Form.
Final Report
Submit Final Report before last week of
spring term.
Gaining work experience prior to
graduation helps university students to succeed in
getting
their first job. For this
reason, some universities insist that all students
must complete a Work
Experience
Requirement. Completing the following six stages
results in the requirements’
fulfillment.
The
process begins with the Application stage. A
student reviews an approved list of
workplaces and submits applications to
places where he would like to work. Next is the
Approval stage. When a student receives
an acceptance letter, he gives it to the professor
for
approval. The third stage,
Schedule, requires a student to arrange his work
schedule. The
student should work at
least 10 hours/week over 20 weeks. Reports are
next. The student
must complete a
Weekly Report Form and turn it in to the professor
every Friday.
The fifth
stage, Evaluation, takes place during the final
work week. A student participates in
an
evaluation meeting with his work supervisor, who
submits an Evaluation Form. The last
stage requires that a student submit a
Final Report before the last week of spring
semester.
By following
these stages and subsequently submitting the final
report, the student receives
credit
from the university.
You
should spend about 20 minutes on this task.
The table below shows the sales at a
small restaurant in a downtown business district.
Summarize the information
by selecting and reporting the main features, and
make comparisons where relevant.
You should write at least 150 words.
Give reasons for your
answer and include any relevant examples from your
own knowledge or experience.
Sales:
week of October 7-13
Lunch
Dinner
Mon.
$$2,400
$$3,623
Tues.
$$2,450
$$3,850
Wed.
$$2,595
$$3,445
Thurs.
$$2,375
$$3,800
Fri.
$$2,500
$$4,350
Sat.
$$1,950
$$2,900
Sun.
$$1,550
$$2,450
model answer:
The sales at this small restaurant
during the week of October 7 to 13th followed a
fairly set
pattern from Monday to
Friday, and then showed notable shift on the
weekend. The lunch
and dinner sales
during the week peaked on Friday and then dipper
down as the weekend set
in.
During the week of October 7-14th, the
lunch sales averaged at approximately $$2,400. The
highest lunch sales occurred on Friday,
and the lowest occurred on Sunday. Sunday's lunch
sales were approximately $$1,000 less
than the average lunch sales during the rest of
the week.
Dinner sales,
which generated at least $$1,000 to $$1,500 more a
day than lunch sales, also
remained
steady during the week. Just like the lunch sales,
the dinner sales peak on Friday
and
dipped down for the weekend.
Excluding Wednesday and Thursday, the
lunch and dinner sales from October 7-11 rose
gradually until the end of the business
week. Midweek, on Wednesday and Thursday, the
sales were slightly lower than they
were on Tuesday.
According
to the sales report, this restaurant has a steady
lunch and dinner crowd. The most
profitable day during the second week
of October was Friday. Sunday, was the least
prof?
itable day, with the
full day's sales totaling/totalling less than the
Friday dinner sales.
These numbers are
reflective of a restaurant that is located in a
business/financial district
where
business hours are Monday through Friday.
You should
spend about 20 minutes on this task.
In
June 1996, an experimental flu vaccine was
trialled in a large country town on females only.
Summarise the information
by selecting and reporting the main features, and
make comparisons where relevant.
You should write at least 150 words.
Give reasons for your
answer and include any relevant examples from your
own knowledge or experience.
model answer:
The diagrams show data for a flu
epidemic which hit a large country town in 1996.
Figure 1
gives the number of persons
who died; Figure 2 shows the percentage breakdown
of females
who received a new flu
vaccine; and Figure 3 gives the number of cases of
flu before and
during the epidemic.
In Figure 1 it can be seen
that the flu was responsible for the deaths of 2
females but no males
in the period from
March to May. However, from June to August, there
were 4 female deaths
and 1 male death.
According to the pie chart
in Figure 2, only those females most at risk were
given the new flu
vaccine; 28% did not
take part in the trial. Of those females who took
part, 35% were aged
(over 65 years
old); 24% were babies or children; and 13% were
either hospitalised or
receiving other
medical attention.
From
Figure 3 it is clear that the new vaccine had a
positive effect on the number of new
cases of flu reported in females. There
were just over 1000 cases reported in March,
climbing
rapidly to a peak of 3500 in
June. Thereafter, the number of cases dropped
slowly to about
2800 in August, before
levelling off at 2500 for the rest of the year.
For males, the figures
were lower but
showed a similar trend throughout the epidemic.
-
-
-
-
-
-
-
-
-
上一篇:护理诊断 (4)
下一篇:小学四年级音乐集体备课