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Although no one is certain why migration occurs, there are several theories. One theory cl

aims that prehistoric birds of the Northern Hemisphere were forced south during the Ice Age. As the glaciers melted, the birds came back to their homelands, spent the summer, and then went south again as the ice advanced in winter. In time, the migration became a habit in spite of the disappearance of glaciers. Another theory proposes that the ancestral home of all modem birds was the tropics. When the region became overpopulated, many species were crowded north. During the summer, there was plenty of food, but during the winter, scarcity forced them to return to the tropics. A more recent theory suggests a relationship between increasing daylight and the stimulation of certain glands (腺) in the birds' bodies that may prepare them for migration. One scientist has been able to cause midwinter migrations by exposing birds to artificial periods of daylight. He has concluded that changes occur in the bodies of birds due to seasonal changes in the length of daylight.According to one theory, when the glaciers disappeared, birds ______.A.stopped migratingB.continued migratingC.stayed in the northD.migrated south and stayed there

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更多“Although no one is certain why…”相关的问题

第1题

_______ more than one hundred elements are known, only twenty－five of them are common and important.

A.Because

B.If

C.Although

D.Whether

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第2题

Many people who work in London prefer to live outside it, and to go to their offices, factories or schools every day by train or by bus, even though this means they have to get up earlier in the morning and 1 home later in the evening.

One benefit of living outside London is that houses are cheaper. Even a small flat in London2

a garden costs quite a lot to rent. With the same money, one can get a little house in the 3 with a garden of his own.

Then, in the country one can be free 4 the noise and hurry of the town. Although one has to get up earlier and spend more time in trains or bused, one can sleep better at night, and, during weekends and on summer evenings, one can enjoy the fresh clean air of the country. If one likes gardening, one can spend one's spare time digging, planting, watering and doing a lot of other jobs which are needed in the garden. Then, when the flowers and vegetables come up, one has the reward of a person who has shared the secrets of 5

1.A.arrive

B.get to

C.go

2.A.Without

B.with

C.near

3.A.city

B.place

C.country

4.A.out of

B.from

C.without

5.A.working

B.nature

C.gardening

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第3题

After a day of work and play, the body needs to rest. Sleep is necessary for good health.

During this time, the body recovers from the activities of the previous day. The rest that you get while sleeping enables your body to prepare itself for the next day.

There are four levels of sleep, each being a little deeper than the one before. As you sleep, your muscles relax little by little. Your heart beats more slowly, and your brain slows down. After you reach the fourth level, your body shifts back and forth from one level of sleep to another. Although your mind slows down, from time to time you will dream. Scientists who study sleep state that when dreaming occurs, your eyeballs begin to move quickly (although your eye-lids are closed). This stage of sleep is called REM, which stands for rapid eye movement.

If you have trouble falling asleep, some people recommend breathing very slowly and very deeply. Other people believe that drinking warm milk will help make you drowsy. There is also an old suggestion that counting sheep will put you to sleep.

A good title for this passage is______.

A．Sleep

B．Good Health

C．Dreams

D．Work and Rest

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第4题

Directions: There are four passages in this part. Each passage is followed by some questio

ns or unfinished statements. For each of them there are four choices marked A, B, C and D. You should decide on the best choice and mark the corresponding letter on the Answer Sheet with a single line through the center.

Passage 1

Questions I to 5 are based on the following passage:

After a busy day of work and play, the body needs to rest. Sleep is necessary for good health. During this time, the body recovers from the activities of the previous day. (76) The rest that you get while sleeping enables your body to prepare itself for the next day.

There are four levels of sleep, each being a little deeper than the one before. As you sleep, your muscles relax little by little. Your heart beats more slowly, and your brain slows down. After you reach the fourth level, your body shifts back and forth from one level of sleep to the other.

Although your mind slows down, from time to time you will dream. Scientists who study sleep state that when dreaming occurs, your eyeballs begin to move more quickly (although your eyelids are closed). This stage of sleep is called REM, which stands for rapid eye movement.

(77) If you have trouble falling asleep, some people recommend breathing very slowly and very deeply. Other people believe that drinking warm milk will help make you drowsy. There is also an old suggestion that counting sheep will put you to sleep!

1. A good title for this passage is .

A. Sleep

B. Good

C. Dreams

D. Work and Rest

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第5题

Brazil has become one of the developing world' s great successes at reducing population gr

owth but more by accident than design. While countries such as India have made joint efforts to【61】birth rates, Brazil has had better result without really trying, says George Martine at Harvard.

Brazil' s population growth【62】has dropped from 2.99% a year between 1951 and 1960【63】1.93% a year between 1981 and 1990, and Brazilian women now have only 2.7 children on average. Martine says this【64】may have fallen still further since 1990, an achievement that makes it the envy of many other Third World countries.

Martine puts it down to, among other things, soap operas (通俗电视连续剧)and installment (分期付款) plans introduced in the 1970s. Both played an important, although indirect,【65】in lowering the birth rate. Brazil is one of the world's biggest producers of soap operas. Globo, Brazil' s most popular television network, shows three hours of soaps six nights a week, while three others show at least one hour a night. Most soaps are based【66】wealthy characters living the high life in big cities.

"Although they have never really tried to work in a message towards the problems of reproduction, they describe middle and upper class values--not many children, different attitudes towards sex, women working," says Martine "They sent this image to all parts of Brazil and【67】people conscious of other patterns of behavior. and other【68】, which were put into a very attractive pack- age. "Meanwhile, the installment plans tried to【69】the poor to become consumers. "This led to an enormous change in consumption patterns and【70】was incompatible'(不相容的)with un- limited reproduction," says Martine.

(41)

A．increase

B．reduce

C．extend

D．improve

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第6题

？Read the text about the importance of qualifications.？In most of the lines 34—45 there is

？Read the text about the importance of qualifications.

？In most of the lines 34—45 there is one extra word. One or two lines, however, are correct.

？If a line is correct, write CORRECT on your Answer Sheet.

？If there is an extra word in the line, write the extra word in CAPITAL LETTERS on your Answer Sheet.

The Importance of Qualifications

Young people and their parents are aware that it is increasingly necessary to

have good qualifications order to get a job nowadays. Going to university and

34. into further education is considered very important by both teenagers and their

35. parents. 63% of teenagers in full-time education want to go on to university or

36. further education, although this figure does decreases as young people

37. approach this big decision. Young women in particular wish to enter the higher

38. education with three times as many girls continuing to studying in preference

39. to going straight to work. Although family influence is still very important in

40. helping the young in make career choices. Today's careers information and

41. work experience play a mater part in decisions about his employment.

42. Over 80% of young people do not want to follow in their parents footsteps

43. by going into the same jobs and 74% of parents would rather prefer their children to

44. choose a different career to their own. Researchers were surprised by this result.

45. And young people who do the same jobs as their parents do not always live happily.

(34)

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第7题

The Supreme Court's recent decision allows regional interstate banks to do away with one r

estriction in America's banking operation, although many others still remain. Although the ruling does not apply to very large money-center banks, it is move in a liberalizing direction that could at last push Congress into framing a sensible legal and regulatory system that allows banks to plan their future beyond the next court case.

The restrictive laws that the courts are interpreting are mainly a legacy of the bank failures of the 1930s. The current high rate -- higher than at any time since the Great Depression -- has made legislators afraid to remove the restrictions. While legislative timidity is understandable, it is also mistaken. One reason so many American banks are getting into trouble is precisely that the old restrictions make it hard for them to build a domestic base large and strong enough to support their activities in today's telecommunicating round-the-clock, around-the-world financial markets. In trying to escape from these restrictions, banks are taking enormous, and what should be unnecessary, risks. For example, would a large bank be buying small, failed savings banks at inflated prices if federal law and states' regulations permitted that bank to expand through the acquisition of financially healthy banks in the region7 Of course not. The solution is clear American banks will be sounder when they are not geographically limited. The House of Representative's banking committee has shown part of the way forward by recommending common-sensible, though limited, legislation for a five-year transition to nationwide banking. This would give regional banks time to group together to form. counterweights to the big money-center banks. Without this breathing space the big money-legislation should be regarded as only a way station on the road towards a complete examination of American's suitable banking legislation.

The author’s attitude towards the current banking laws is best described as one of _______.

A．concerned dissatisfaction

B．tolerant disapproval

C．uncaring indifference

D．great admiration

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第8题

Passage One Every morning, kids from a local high school are working hard. They are maki

Passage One

Every morning, kids from a local high school are working hard. They are making and selling special coffee at a coffee cafe. They are also making a lot of money.

These students can make up to twelve hundred dollars a day. They are selling their special coffee to airplane passengers. After the students get paid, the rest of the money goes to helping a local youth project.

These high school students use a space in the Oakland airport. It is usually very crowded. Many people who fly on the planes like to drink the special coffee.

One customer thinks that the coffee costs a lot but it is good and worth it. Most customers are pleasant but some are unhappy. They do not like it if the coffee cafe is not open for business.

The students earn $ 6.10 an hour plus tips. They also get school credit while they learn how to run a business. Many of the students enjoy the work although it took some time 1o learn how to do it.

They have to learn how to steam milk, load the pots, and add flavor. It takes some skill and sometimes

mistakes are made. The most common mistake is forgetting to add the coffee.

36. Based on the passage, it seems that the purpose of the cafe is to______.

A. learn a skill

B. help a youth project

C. do business

D. earn school credit

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第9题

Under normal conditions the act of communication requires the presence of at least two per

sons: one who sends and one who receives the communication. In order to communicate thoughts and feelings, there must be a conventional system of signs or symbols which mean the same to the sender and the receiver.

The means of sending communications are too numerous and varied for a systematic classification; therefore, the analysis must begin with the means of receiving communication. Reception of communication is achieved by our senses. Sight, hearing, and touch play the most important roles. Smell and taste play very limited roles, for they cannot receive intellectual expression from fully developed systems of signs and symbols.

Examples of visual communication are gesture and mimicry. Although both frequently accompany speech, there are systems that rely solely on sight such as those used by deaf and dumb persons. Another means of communicating visually is by signals of fire, smoke, flags, of flashing lights. Feelings may be simply communicated by touch, such as by handshaking or backslapping, although a highly developed system of hand stroking has enabled blind, deaf, and dumb persons to communicate intelligently. Whistling to someone, applauding in a theater, and other forms of communication by sound rely upon the ear as a receiver. The most fully developed form. of auditory communication is, of course, the spoken language.

The means of communication mentioned so far have two features in common: they last only a short time, and the person involved must be relatively close to each other. Therefore all are restricted in time and space.

Why does the author begin his analysis with the means of receiving communication rather than the means of sending communication？

A．Communication actually takes place when the message is received.

B．There are more means of receiving than of sending communications.

C．Reception of communications involves of the senses.

D．It is difficult to organize by type the means of sending communications.

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第10题

Japan is a small country with few natural resources.（11 ) this，Japanese productivity

Japan is a small country with few natural resources. (11 ) this，Japanese productivity，the rate at which goods are produced，(12 ) more than eleven times in the past thirty years.Many people in the West

wonder how the Japanese do it.The key (13 ) Japan's success can be discovered by looking at some basic differences between Japanese and Western attitudes towards work.People in the West generally view work (14 ) a necessary evil--one must give up part of one's freedom to earn the money needed to live. To the Japanese, however, work is the central interest of one's life;it's (15 ) that a Japanese established his identity.A Japanese business firm is like a family.When an employee joins a company，he expects to work for that company for the rest of his working life;(16 ) is anyone dismissed.Promotion is based on the seniority system，the length of employment (17 ) one's rank in the company. Those at the bottom do not (18 ) Chances for promotion because those at the top retire at a certain age (19 ) others may have their turn.In addition，the difference betweenthe lowest and the highest salaries is much 1ess than (20 ) in the West.

11.[A]Because of [B]As for [C]Although [D]Despite

12.[A]have increased [B]has increased [C]are increasing [D]is increasing

13.[A]to [B]of [C]for [D]in

14.[A]like [B]for [C]about [D]as

15.[A]this [B]that [C]here [D]where

16.[A]barely [B]rarely [C]occasionally [D]frequently

17.[A]determines [B]has determined [C]determining [D]to determine

18.[A]care about [B]care for [C]worry about [D]concern with

19.[A]in that [B]such that [C]for that [D]so that

20.[A]that [B]those [C]one [D]ones

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