英语专四听力dictation

Digital cameras

According to a standard definition, a digital camera is a camera that produces digital

images

that

can be

stored

in a

computer,

displayed on

a

screen

and

printed. Years

ago, people used to possess two different devices in order to take pictures and make

videos.

The

creation

of digital

cameras

was

motivated

mainly by two

factors.

First,

need to spare space. Second make it more comfortable for people to do both things

with

higher

quality

results.

the

multi-functionalism

of

digital

cameras

and

combination of several devices in one make it a popular choice for a modern man.

For

years

a

digital

camera

has

been

unaffordable

for

many

families.

However,

the

variety

of

digital

cameras

and

various

prices

nowadays

make

it

possible

for

almost

every single family to buy a digital camera. With increasingly fierce competition, the

digital

camera

manufactures

satisfy

customers

with

lower

prices

but

best

quality

standards.

The migration of birds

The most obvious feature of birds is that they can fly. This facility gives them great

mobility

and

control

over

their

movements.

Many

species

can

travel

quickly

and

economically

over

long

distances,

up

to

thousands

of

kilometers,

if

necessary,

crossing seas, deserts or other inhospitable

areas. They also have great orientation

and navigational skills and are able to remember and re-find remote places they have

previously

visited.

Birds

can

thereby

occupy

widely

separated

areas

at

different

seasons,

returning

repeatedly

to

the

same

localities

from

year

to

year.

Although

migration is evident in other animal groups, including insects, mammals and fish, in

none

is

it

as

widely

and

well-developed

as

in

birds.

The

collective

travel

routes

of

birds span almost the entire planet. As a result

of migration, birds’

distributions are

continually

changing

on

regular

seasonal

patterns

and

on

local,

regional

or

global

scales.

Benefits of becoming a teacher

Becoming a teacher gives you a

chance to spend a major portion of your day with

children or youngsters. With kids around, you are a part of their world of innocence

and

purity.

It

indeed

creates

a

healthy

work

environment

for

you.

On

becoming

a

teacher, you get a chance to be with children, laughing with them, think their way

and enjoy their innocent, silly and hopefully naughty behavior. Apart from this, the

nature of your job is that you do not work on weekends

and you get your share of

holidays.

Becoming

a

teacher

entitles

you

for

receiving

private

scholarships

and

sponsorships for teaching programs. However, one of the most important benefits of

becoming

a

teacher

is

that

teachers

contribute

to

the

shaping

of

the

future

generations.

They

make

a

difference

to

society

by

playing

a

vital

role

in

nurturing

young minds.

British and American police officers

Real

policemen

both

in

Britain

and

the

U.S.

hardly

recognize

any

common

points

between their lives and what they see on

TV, if they ever get home in time. Some