-
《英语
B1
》课程习题集
西南科技大学成人、网络教育学院
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习题
【说明】
：本课程《英语
B1
》
（编号为
01004
）共有单选题
,
写作题
,
英语完形填
空
,
英语阅读理解
,
汉
译英等多种试题类型，其中，本习题集中有
[
汉译英
,
写作
题
]
等试题类型未进入。
一、单选题
1.
Can you find out ____C___
her pen?
A. where Alice had
put
C. where Alice has put
A. for the car breaks down
C. that the car broke down
A. what
B. that
A. that
B. where had Alice
put
D. where has Alice put
B. due to the car breaking down
D. because the car broke down
D. when
D. with which
C. where…where
D.
wha
t…which
2.
The reason
we
’re so late is
___C_____.
3.
Word has come
___B__ some guests from Canada will visit our
school.
C. whether
4.
The two elements ___C____
water is made are oxygen and hydrogen.
B. which
C. of which
5.
The time will come
___B___ man can fly ______ he likes in the
universe.
A. how…where
B. when…wherever
6.
Women workers wear hats
_B_
_ their hair gets caught in the
machinery.
A. if B. in case
C
. unless D. because
7.
___D_____ he works hard,
I don
’t mind when he finishes the
experiment
.
A. As soon as
B. As well as
C. So far as
D. So long as
8.
The young driver looked over the engine carefully
lest it ____B____ on the way.
A. goes
wrong B. should go wrong
C. went wrong
D
. would go wrong
9.
All things _____C___, the
planned trip will have to be called off.
A. considering
B. be considered
C.
considered
D. having considered
10.
The problem remains
___B_____ the rescue teams could arrive in time.
A. if B. whether
C. when
D. that
11.
Boris has brains. In fact, I doubt whether anyone
in the class has ____B____ IQ.
A. a
high B. a higher
A. than
B.
to
C
. as
French.
A. were
B. are
C.
the higher
D. the highest
D.
for
12.
This western
restaurant is superior _____B___ the one we went
to last week.
13.
Either
of
these
young
ladies
___C_____
perfectly
qualified
to
teach
Greek,
Latin
and
C. is
D. have been
B. how excited they were
D. they were how excited
14.
Y
ou can’t
imagine ___
B__ when they received these
gifts.
A. how they were
excited
C. how excited they have
A. that
15.
Do
___B____ you are told; otherwise you will be
punished.
B. what
C. which
D. whom
16.
___B
__ the
old man’s sons wanted to know was _____ the gold
had been hidden.
A.
That…what
B
.
What…where
C.
What…that
D.
That…where
17.
Is
this museum ___D____ you visited a few days ago?
A. where B. that
A. to
C. on which
D. the one
D. of
C. Because of
D. As or
18.
There’s no
question th
at the ads had a real impact
__
C___ the
public.
B. with
C. on
19.
____B___ the English
examination I would have gone to the concert last
Saturday.
A. In spite of
B.
But for
20.
We’ll
visit Europe next year
____A____ we
have enough money.
A. provided
B. unless C. until
D. lest
21.
It’s already
5 o’clock now. Don’t you think it’s about time
____C____?
A. we are going
home
B. we go home
C. we went home
D. we can go home
22.
With John ___C_____
there
’s more room in the
ho
use.
A. to be away
B. been away
C. away
D. was away
23.
How beautifully she sings! I have never heard
____D____.
A. the better
voice
B. a good voice
C. the
best voice
D. a better voice
24.
When spring comes, it
gets ____C____.
A. warm and warm
B. warm and warmer
C. warmer
and warmer
D. more and more
warm
25.
Large quantities of
water ____B____ cooling purposes.
A.
are needed for
B. is needed for
A. about
B. of
A.
that
C. as
D. that
D. as.
C. are need to
D. is need for
26.
He told me the news ___
D __ our team had won the
game.
27.
A good
many proposals were raised by the delegates ___
D __ was to be expected.
B. what
C. so
28.
She is waiting for the
doctor ___B
__ I know will
not come.
A. whom B. who
C. which
D. that
29.
The sales manager asked
his men to inform him ___B__ everything concerning
the sales in
time.
A. /
A. as
B. of
B. so
C. againstD. on
C. though
D
.
although
D. higher than
30.
Young __A___ John was,
he was able to swim across the channel within
minutes.
31.
Most of the
stones are _____D___ a man and weigh about two and
a half tons each.
A. more high
B. much more high C. higher more
A. handing in
B.
having handed in
C. to be handed in
D. having been handed in
32.
All examination paper
_____D___, the teacher let the students leave.
33.
The
temperature___C_____, the chemical reaction is
being speeded up.
A. raised
B. being risen
C. rising
D. raising
34.
___A_____ fashion varies from country to country
may reflect the cultural differences in a
sense.
A. That
B.
What
C. Whether
A. less
B. the less
D. Which
D. the lesser
35.
The more he tried to help her, ____B____ she
seemed to appreciate it.
C. the least
36.
His father is ___C_____
than his mother.
A. older four years
C. four years older
B. as four years older
D. four years bigger
B. is a
good insulator
D. are good insulators
D. which
37.
Copper as well as most metals ____A____.
A. is a good conductor
C. are good conductor
A. whether
38.
I
doubt ____A____ he will lend you the book.
B. when
C. that
39.
Students in
his class can’t understa
nd
_____C__________.
A. what does the
sentence mean
B. what means this
sentence
C. what this sentence means
D. what is the meaning of the sentence
40.
It makes no difference
to me ____D____ he will come or not.
A.
how
B. why
C. when
D. whether
41.
Mary is the only one of the team members ___A_____
to be transferred.
A. who is going
B. who are going
C. who have been going
D.
who has been going
42.
Is
this the place___ A
__ the
exhibition was held?
A.
where B. that
C. on which
D.
how
B. a lot better than
D.
much more well than
43.
Frank plays ____B____ Alex.
A. a lot
more better than
C. much more better
than
44.
I
didn’t remember his name _____
C___
after I had greeted him.
A. when
B. as
C. until
D.
while
45.
We
didn’t know his telephone number, otherwise
we _____A___ him.
A. would
have telephone
B. must have telephoned
C. would telephone
D. had
telephoned
46.
________, he
slipped through the window.
A. With
anyone noticing
B. With
anyone noticed
C. Without anyone
noticing
D. Without nobody noticed
47.
Two policemen happened
____C____ the traffic at the crossroads when his
car was hit by a
drunk driver.
A. to direct
B. to directing
C. to be directing
D. to be directed
48.
The murderer was brought
in, with his hands ____C____ behind his back.
A. to be tied
B.
being tied
C. tied
D. having been tied
49.
I think English is
____C____ than Japanese.
A. much
important
B. important
C. much more important
D.
more much important
50.
There used to be some trees by the lake,
____C____?
A. was there
B.
were there
C
. weren’t
there
A. that
B.
whatever
C. whichever
D.
those
C. what
D. why
D. wasn’t there
51.
We must do well
____B____ the boss assigns us to do.
52.
We don’t
doubt ____
B____ he can make a good job
of it.
A. if B. that
53.
____A___ is unknown to
me.
A. Where he isB. Where is he
C
. He is where
D
. Is he where
54.
----- Who is John Smith?
----- He is the speaker ____C____ heard
last week.
A. which we would have
B. we would have
C. we
D. we had
55.
The girl desires that
she ____D____ an opportunity to receive higher
education.
A. should give B. given
C. be giving
D. be given
56.
The instruments of the
older factory ____D____.
A. is as good
or better than the new one
B. are as
good or better than the new one
C. is
as good as or better than those of the new one
D. are as good as or better than those
of the new one
57.
____B____
the door than somebody started knocking on it.
A. I had closed no sooner
C.
I had no sooner closed
B. No sooner had I closed
D.
No sooner I closed
58.
To some extent,
unemployment as well as taxes ____A____ votes.
A. influences
B. influence
C. have influenced
D. has
influenced
59.
The question
____D____ finally, we went home.
A. to
be settled
B. settling
C.
having settled
D. settled
60.
The soldiers jumped into
the river _____A___ past their ears.
A.
with bullets whistling
C.
with bullets to whistle
B. with bullets
whistled
D. with bullets being
whistling
B. where were their stockings
D. what was their stocking in
61.
The small children were
eager to know ___A_____.
A. what was in
their stockings
C. where was in their
stockings
A. no
62.
This room is ____A____
much larger than that one.
B. not a
C. no a
D. as
63.
Of the two cups, he
bought ____A____ one.
A. the smaller B.
the smallest
C
. small
D. smaller
64.
War and peace ____A____ a constant theme in the
history of the world.
A. is
B. are
C. have been
D. has been
65.
Hen has a new car. I wonder when ____A____ it.
A. he bought
B. did he buy
C. buys
D. he is buying
66.
I was sure ____B____ I
would overcome all these difficulties.
A. what
B. that
C. which
D. whether
D. the place
67.
No one was aware ____C____ Jane had gone.
A. where that
B. of the
place C. of where
A. what
B.
where
C. which
D. wherever
68.
The village _____C___ my
mother grew up in is not far from the city.
69.
The rest of the
magazines ____C____ on sale today.
A.
is
B. have
C. are
D. has
70.
The
higher the standard of living, ___D_____.
A. the greater is the amount of paper
is used
B. the greater amount of paper
is used
C. the amount of paper is used
is greater
D. the greater the amount of
paper is used
71.
If he had
worked harder, he ____C____ the exams.
A. must have got through
C.
would have got through
B. would get
through
D. could get through
72.
It is politely requested
by the hotel management that radios ___C_____
after 11 o
’
clock at
night.
A. were not played
B. not to play
C. not be
played
A. He guided
B. With
his guiding C. He is guiding
D. did not play
D. He had guided
73.
___B_____, they made
their way through the street.
74.
It
was
___C_____
fun
to
play
games
on
the
grassland
that
more
and
more
children
gathered.
A. such a greatB. so great a
C. such great
D. so great
75.
If his grandparents were
___A_____, Joseph would have a happier childhood.
A. alive
B. live
C. living
D. lived
二、英语完形填空
76.
Most children with
healthy appetites are ready to eat almost anything
that is offered them
and a child rarely
dislikes food (
1
) it is badly cooked. The (
2
)
a meal is cooked and
served is the most
important and an (
3
)
served meal
will often improve a child’s appetite.
Never ask a child (
4
) he likes or
dislikes a food and never (
5
) likes and
dislikes in front
of him or allow (
6
)
else to do so. If the father says he hates fat
meat or the mother (
7
)
vegetables in
the child’s hearing, he is
(
8
)
to copy this procedure. Take it (
9
) granted
that he likes everything and he
probably (
10
). Nothing healthful should be omitted
from the
meal because of a (
11
)
dislike. At meal times it is a good (
12
) to give a
child a small
portion and let him (
13
)
back for a second helping rather than give him as
(
14
) as he is
likely to eat all
at once. Do not talk too much to the child (
15
)
meal times, but let him get
on with his
food; and do not (
16
) him to leave the table
immediately after a meal or he will
(
17
)
learn
to
swallow
his
food
(
18
)
he
can
hurry
back
to
his
toys.
Under
(
19
)
circumstances must a child be
coaxed(
哄骗
) (
20
) forced to
eat.
D.1. A. if B. until
C.
that
D. unless
C.2. A.
procedure
B. process
C. way
D. method
B.3. A. adequately
B. attractively C. urgently
D. eagerly
A.4. A. whether
B. what
C. that
D. which
C.5. A. remark
B
. tell
C.
discuss
D. argue
B.6. A.
everybody
B. anybody
C.
somebody
D. nobody
C.7. A.
opposes
B. denies C. refusesD. offends
D.8. A. willing
B
. possible
C.
obliged
D. likely
D.9. A.
with
B. as
C. over
D. for
C.10. A. should
B. may
C. will
D.
must
A.11. A. supposed
B.
proved
C
. considered
D. related
C.12. A. point B.
custom
C. idea
D. plan
B.13. A. ask
B. come
C. return
D. take
A.14. A. much B. little
C.
few
D. many
D.15. A. on
B. over
C. by
D.
during
B.16. A. agree B. allow
C. force
D. persuade
B.17. A. hurriedly
B. soon
C. fast
D. slowly
A.18. A. so
B. until
C. lest
D. although
D.19. A. some B. much
C.
such
D. no
A.20. A. or
B. nor
C. but
D.
neither
77.
In
Japan,
most
people
still
feel
that
a
woman’s
place
is
in
the
home;
and
most
women
willingly accept their (
1
) role as
wife, leaving the business of making a living (
2
)
their
husbands. For those who do want a
(
3
) of their own, opportunities are
limited, and working
women usually have
to (
4
) for lower wages, fewer promotions,
less responsible (
5
).
In
America,
on
the
other
hand,
most
women,
(
6
) wives
and
mothers,
work
most
of
their
lives, but (
7
), few have had real
careers. As in Japan most fields are (
8
) by men and
opportunities
for
women
have
been
(
9
),
salaries
low,
chances
for
advancement
(
10
)
American
women
work
mainly
because
they
(
11
),
in
these
days
of
inflation
and
luxury
living.
(
12
)
income
per
family
is
simply
not
enough
to
(
13
).
So
American
women
actually
have
two
jobs:
one
nine-to-five
position
outside
the
home,
and
(
14
)
round-the-clock-in-the-
home-job (
15
) wife, house-maid, cook, and nurse.
One
of
the
main
goals
of
the
modern
women’s
liberation
movement,
which
started
(
16
),
was to eliminate sex discrimination in
the work force, and to (
17
) careers for women that
were previously (
18
) for men.
Though there is still a long way to (
19
), a lot of
progress
has been (
20
).
C.1. A. conservative
B.
usual
C. traditional
D.
unhappy
C.2. A. for
B. no
C. up to
D. away with
B.3. A. job
B. career
C. profession
D. post
A.4. A. settle
B. request
C. ask
D.5. A.
titles
B. status
C.
assignments
D. positions
B.6. ning
B. including
C. containing
D. involving
B.7. A. at present
B. until
recently
C. recently
until
recently
D..8. A. owned
B.
kept
C. led
D. dominated
A.9. A. restricted
B.
bounded
C. reduced
D.
prohibited
C.10. A. small B. inadequate
C. rare
D. scarce
D.11. A. should
B. ought
C. like
D. have to
A.12.
B. single
C. only
D. the one
B.13.
B. live on
C
. feed on
D.
support
D.14. A. another
B.
one
C. other
D. the other
A.15. A. such as
B. like
C. as
D. acting
A.16. A. in the early 1960s
B. in early the 1960s
C.
early in the 1960
D. in the
early 1960
B.17. A. lead to
B. open up
C. offer
D. set up
D.18. A. preserved
B. observed
C. concerned
D. reserved
A.19. A. go
B. travel
C. strive
D. pull through
A.20. A.
made B. taken
C. covered
D.
completed
78.
Du
ring recent years we have heard much
about “race”: how this race does certain things
and that race believes certain things
and so on. Yet, the (
1
) phenomenon of race
consists of
a few surface indications.
We judge race usually (
2
) the coloring
of the skin: a white race, a brown race, a yellow
race
and a black race. But (
3
)
you were to remove the
skin
，
you could
not (
4
) anything
about the race to
which the individual belonged. There is (
5
)
in physical structure, the brain
or the
internal organs to (
6
) a difference.
There are four types of blood. (
7
)
types are found in every race, and no type is
distinct to
any race. Human brains are
the (
8
). No scientists could examine a brain
and tell
you the
race to
which the individual belonged. Brains will (
9
)
in size, but this occurs within every
race.
(
10
) does size
have anything to do with intelligence. The largest
brain (
11
) examined
belonged
to
a
person
of
weak
(
12
).
On
the
other
hand,
some
of
our
most
distinguished
people have
had (
13
) brains.
Mental
tests
which
are
reasonably
(
14
)
show
how
no
differences
in
intelligence
between
races. High and low test results both
can be recorded by different members of any race.
(
15
)
equal educational
advantages, there will be no difference in average
standings, either on account
of race or
geographical(
地理的
)location.
Individuals
of
every
race
(
16
)
civilization
to
go
backward
or
forward.
Training
and
education can change the
response of a group of people, (
17
) enable them
to behave in a
(
18
)
way.
The behaviors and ideals of people
change according to circumstances, but they can
always go
back or go on to something
new (
19
) is better and higher than anything (
20
)
the past.
D.1. A. complete
B. full
C. total
D. whole
B.2. A. in B. from
C. at
D. on
B.3.
A. since
B. if C. as
D.
while
C.4. A. speak
B. talk
C. tell
D. mention
C.5. A. something
B.
everything
C. nothing
D.
anything
B.6. A. display
B
. indicate
C.
demonstrate
D. appear
A.7.
A. All
B. Most
C. No
D. Some
A.8. A. same
B. identical
C. similar
D
. alike
D.9. A.
remain
B
. increase
C. decrease
D. vary
C.10. A. Only
B. Or
C. Nor
D. So
D.11. A. ever
B. then
C. never
D. once
C.12. A. health
B. body
C. mind
D. thought
B.13. A. big
B. small
C. minor
D. major
D.14. A. true
B. exact
C. certain
D. accurate
C.15. A. Provided
B.
Concerning
D. Following
B.16. A. make B. cause
C.
move
D. turn
A.17. A. and
B. but
C. though
D
. so
B.18. A.
ordinary
B. peculiar
C.
usual
D. common
A.19. A.
that
C. whichever
D. whatever
D.20. A. for
C. within D. in
79.
Are some people born
clever, and others born (
1
)? Or is intelligence
developed by our
environment and our
experiences? (
2
), the answer to both these
questions is yes. (
3
)
some extent
our intelligence is given us at birth, and no (
4
)
of special education can make a
genius
(
5
)
a
child
born
with
low
intelligence.
(
6
),
a
child
who
lives
in
a
boring
environment
will
(
7
)
his
intelligence
less
than
one
who
lives
in
rich
and
(
8
)
surroundings. Thus the limits of a
person's intelligence are fixed at birth, (
9
)
whether or not
he
reaches
those
limits
will
depend
on
his
environment.
This
(
10
),
now
held
by
most
experts,
can be supported in a number of ways.
(
11
)
is easy to show that intelligence is to some
extent something we are born (
12
).
The
closer
the
blood
relationship
between
two
people,
the
closer
they
are
(
13
)
to
be
in
intelligence. Thus (
14
)
we take two unrelated people at random from the
population, it is
likely that their
degrees of (
15
) will be completely different. If on
the other hand we take
two (
16
)
twins, they will very likely be as intelligent as
each other. Relations like brothers
and
sisters,
parents
and
children,
(
17
)
have
similar
intelligence,
and
this
clearly
suggests
that intelligence
depends on birth. Imagine now (
18
) we take two
identical twins and put
them in
different environments. We would soon (
19
)
differences in intelligence developing,
and this indicates that (
20
) as well as
birth plays a part.
D.1. A. wise
B. intelligent
C. bright
D. stupid
C.2. A. By no
means
B. Strangely enough
C.
Sure enough
D. For sure
A.3.
A. To
B. In
C. With
D. On
B.4. A. number
B. account
C. quantity
D. quality
C.5. A. into
B. from
C. out of
D. by
A.6. A. On the other
hand
B. On the one hand
C. In this sense
D. As far as we know
D.7. A.
decrease
B. descend
C.
delete
D. develop
B.8. A.
varying
B. varied C. healthful
D. hygienic
D.9. A. although
B. so
C. thus
D.
but
B.10. A. outlook
B. view
C. speculation D. judgment
C.11. A. That
B. This
C. It D. So
A.12. A. with
B. for
C. to
D
. in
B.13. A.
possible
B. likely
C.
impossible
D. unlikely
C.14.
A. whether
B. when
C. if D.
unless
B.15. A. intimacy
B.
intelligence C. similarity
D.
difference
B.16. A. same B. identical
C. parallel
D. related
C.17. A. certainly
B.
undoubtedly
C. usually
D.
sometimes
B.18. A. if
B.
that
C. when
D. while
B.19. A. see
B. find out
C. find
D. work out
A.20. A. environment
B.
development
C. blood
D.
education
80.
Vitamins are a
group of substances found in food. The body needs
them for life and health.
So (
1
),
many people are concerned
(
2
)
the question: Am I getting enough vitamins,
and am I getting the (
3
) kind?
Even
though
very
small
(
4
)
of
each
vitamin
are
enough
for
the
(
5
)
of
the
body,
the
worry
people
have
about
vitamins
has
some
basis. And
this
has
to
do
(
6
)
their
diet---
the
food they take in. A person eating
a good (
7
) of foods get all the vitamins now (
8
)
to
be needed.
The
problem
is
that
there
are
many
people
(
9
)
don’t
choose
foods
wisely.
So
the
answer
(
10
) this question is: No (
11
) vitamins
are needed, (
12
) you eat proper foods. In
fact, many of the vitamins cannot be (
13
)
in the body, so when extra vitamins are taken in,
the body simply gets rid of them. It is
even (
14
) to put too much of certain vitamins
into the
body. This has been found to
be true (
15
) vitamin A and D, when large amounts
are taken
(
16
).
What foods
supply what vitamins? Here is a quick (
17
)
idea. Vitamin A for the (
18
) of
the
eyes,
skin,
teeth,
and
bones,
is
found
in
green
vegetables,
fruits,
eggs,
liver
and
butter.
Vitamin B1 which (
19
) the nervous
and digestive (
20
) and prevents certain
diseases, is
found in cereals, pork and
liver. VitaminB2 is found in milk, eggs, green
vegetables and meats.
Vitamin
C,
which
helps
bones
and
teeth,
is
found
in
tomatoes,
certain
fruits
and
vegetables.
These are only a
few of the most important vitamins the body needs.
B.1. A. normally
B. naturally
C. predictably
D. likely
C.2. A. of
B
. in
C
. with
D. at
D.3. A. particular
B. exact
C. special
D
.
right
D.4. A. numbers
B.
qualities
C. volumes
D.
amounts
A.5. A. needs
B.
standards
C. hunger
D
. wish
B.6. A.
to B. with
C. of
D. about
A.7. A. variety
B
. kind
C. sort
D. range
B.8. A. clear
B. known
C. acquainted
D. understood
D.9. A. they
B. which
C. whose D. who
B.10. A. at
B. to
C
. of
D. about
C.11. A. rich
B. exceptional
C. extra
D. plenty
B.12. A.
when B. providing
C. where
D. that
C.13. A. saved B.
digested
C. stored
D.
assembled
C.14. A. harmless
B. beneficial
C. harmful
D. fatal
B.15. A. to
B. of
C. in
D
. at
C.16. A.
down B. up
C. in
D
. to
C.17. A. specific
B.
detailed
C. general
D. vague
B.18. A. sake
B. health
C. favor
D. interest
D.19. A. forms
B
.
harms
C. changes
D .helps
B.20. A. part
B. system
C
. collection
D.
combination
三、英语阅读理解
81.
Holidays
in
the
United
States
usually
occur
at
least
once
a
month.
Most
months
have
a
national
holiday
that
has
been
arranged
to
be
celebrated
on
a
Monday.
The
holidays
have
all
been decided to be celebrated on a
Monday so that the workers may have 3-day
weekends--- that
is, Saturday, Sunday
and Monday in order to rest or travel or do things
with their families. Major
holidays in
the United States such as New Year’s Day or
Christmas Day or the day, when we
remember the first settlers of the
United States, called Thanksgiving Day are
celebrated all over
the
country.
During
these
holidays
most
businesses
close
and
the
workers
stay
home
and
celebrate with their
family.
Vacation
can
be
from
2
weeks
a
year
to
4
weeks
a
year.
This
usually
depends
on
how
long
you’ve been working for a company, what
type of position you have, whether you have a very
high position or a very important
position and it’s difficult to find someone to
replace
you. In this case,
you might take a few days at a time rather than
taking one month all at once.
Usually
the
more
time
you
spend
working
for
a
company,
the
more
time
you
may
get
for
vacation.
1.
The
government
of
the
United
States
makes
it
a
rule
for
workers
to
have
a
___
weekend
almost once a month.
A.
1-day
B. 2-day
C. 3-day
D. 4-day
2. Workers in the
United States sometimes work from___.
A. Monday to Saturday
B.
Tuesday to Sunday
C. Thursday to Friday
D. Tuesday to Friday
3.
Which statement is not true according to this
passage?
A. Only a few shops remain
open on New Years Day.
B. Most of the
workers needn’t work on Christmas Day.
C. Days on vacation must be more than
all the holidays in a year.
D. All the
workers have a half month vacation at last.
4. The reason why someone has to divide
his vacation into several parts is that ___.
A. no one can be found to take his
place
B. he hasn’t a most high
position
C. he plays an
important role in his work
D. he hasn’t
been working for his company for a long
time
5. Which of the
following is the best title for this passage?
A. Holidays in the United States
B. Vacation in the United States.
C. How do the workers spend their
holidays.
D. Something about the
holidays and vacation in the U.S..
82.
Why don’t
birds get lost in their long migratory flights?
Scientists have been puzzled o
ver
this question for many years. Now
they’re beginning to fill in the
blanks.
Not long ago,
experiments showed that birds rely on the sun to
guide them during daylight hours.
But
what about birds that fly mainly at night? Tests
with artificial stars have proved conclusively
that certain night-flying birds are
able to follow the star in their long-distance
flights.
One
such
bird---a
warbler(
鸣禽
)---had
spent
its
lifetime
in
a
cage
and
never
flown
under
the
natural sky. Yet it showed an inborn
ability to use the stars for guidance. The bird’s
cage was
placed
under
an
artificial
star-filled
sky
at
migration
time.
The
bird
tried
to
fly
in
the
same
direction as that taken by his outdoor
cousins. Any change in the position of the make-
believe
stars caused a change in the
direction of his flight.
Scientists
think that warbler, when flying in daylight, use
the sun for guidance. But the stars are
apparently their principal means of
navigation. What do they do when the stars are
hidden by
clouds? Apparently, they find
their way by such landmarks as mountain ranges,
coast lines, and
river courses. But
when it’s too dark to see the
se, the
warblers circle helplessly, unable to get
their bearings.
1.
The reason why birds don’t get lost in
migratory flights
A. have
been known to scientists for years .
B.
have only recently been discovered.
C.
are known by everyone.
D.
will probably remain a mystery.
2. The
experiment with the warbler indicated that
A. birds have to be taught to navigate.
B. a bird that has been caged will not
migrate.
C. some birds cannot fly at
night.
D. some birds seem
instinctively to follow the star when flying at
night.
3. Under artificial stars, the
bird in the cage
A. tried to fly in the
same direction as birds not caged .
B.
changed direction when the position of the stars
was changed.
C. would not fly at all.
D. both A and B.
4. Warblers migrate
A. from
North American to the Falkland Islands.
B. only once during their lifetime.
C. using what is apparently
an inborn navigational ability.
D. when they are freed from their
cages.
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