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请认真阅读下列短文，并根据所读内容在文章后表格中的空格里填入一个最恰当的单词。
For more than twenty years scientists have been seeking to understand the mystery of the‘‘sixth sense"of direction．By trying out ideas and solving problems one by one, they are now getting closer to one answer．
One funny idea is that animals might have a built-in compass(指南针)．
Our earth itself is a big magnet(磁体)．So a little magnetic needle that swings freely lines itself with the big earth magnet to point north and south．When people discovered that idea about athousand years ago and invented the compass, it allowed sailors to navigate(航海)on oceanvoyages, even under cloudy skies．
Actuallly the idea of the living compass came just from observing animals in nature．
Many birds migrate twice a year between their summer homes and winter homes．Some of them fly for thousands of kilometers and mostly at night．Experiments have shown that some birds can recognize star patterns．But they can keep on course even under cloudy skies．How can they do that?
A common bird that does not migrate but is great at finding its way home is the homing pigeon．Not all pigeons can find their way home．Those that can are very good at it, and they have been widely studied．
One interesting experiment was to attach little magnets to the birds' heads to block their magnetic sense－just as a loud radio can keep you from hearing a call to dinner．On sunny days, that did not fool the pigeons．Evidently they can use the sun to tell which way they are going．But on cloudy days, the pigeons with magnets could not find their way．It was as if the magnets had blocked their magnetic sense．
Similar experiments with the same kind of results were done with honeybees．These insects also seem to have a special sense ot direction．
In spite of the experiments, the idea of an animal compass seemed pretty extraordinary．How would an animal get the magnetic stuff for a compass．
An answer came from an unexpected source．A scientist was studying bacteria that live in the mud of ponds and marshes．He found accidentally little rod-like bacteria that all swam together in one direction－north．
Further study showed that each little bacterium had a chain of dense particles inside, which proved magnetic．The bacteria had made themselves into little magnets that could line up with the earth's magnet．
The big news was that a living thing, even a simple bacterium, can make magnetite．That led to a search to see whether animals might have it．．By using a special instrument called magnetometer, scientists were able to find magnetite in bees and birds, and even in fish．In each animal, except for the bee．the magnetic stuff was always in or closer to the brain．
Thus．the idea of a built－in animal compass began to seem reasonable．
In 1990 a report was published about what the earth might be like 20 years from then on. The report was a result of a three-year ___1___.
according to the report, the picture of the earth in the year 2010 is not a ___2___ one. The world will be more ___3___ because the population will continue to grow. The population could be ___4___ 6 300 million, almost 2 150 million more than in 1985. More people would move into cities, especially cities in ___5___ countries. Cities like Cairo and Jakarta probably would ___6___ have 15 million by then.
Food production will ___7___, but not enough to feed all the people. Farmers will grow 90% more food than they did in 1985, ___8___ most of the increase would be in countries that ___9___ produce enough food for their people. Little increase is ___10___ in South Asia, Africa and the Middle East. Poor farming ways are ___11___ large areas of crop land, changing farms into deserts. More farmland is ___12___ as cities become larger and more houses are built. ___13___ will get worse as industrial countries burn more coal and oil. Many of the world’s ___14___ could disappear as more and more trees are cut down. Energy will continue to be a serious problem. The experts say their picture of the earth for the year 2010 ___15___. They only carried out the situation that ___16___ today. By changing the situation, by ___17___ the problems, the picture can be changed. There is ___18___ time for the nations of the world to work ___19___ a plan of action. But they warned that ___20___ too long to make decisions would greatly reduce the chances of success.
1. A. learning B. project C. notice D. study
2. A. pleased B. pleasant C. safe D. blue
3. A. dangerous B. beautiful C. crowded D. terrible
4. A. no more than B. as many as C. as much as D. as large as
5. A. developing B. developed C. big D. mountainous
6. A. none B. each C. all D. neither
7. A. insist B. reduce C. increase D. continue
8. A. so B. but C. or D. however
9. A. already B. hardly C. partly D. never
10. A. wanted B. lacked C. found D. expected
11. A. destroying B. protecting C. disturbing D. interrupting
12. A. saved B. lost C. discovered D. used
13. A. Air pollution B. Water pollution C. Some diseases D. All farmland
14. A. animals B. plants C. forests D. people
15. A. must be true B. will come true C. can’t be true D. may be wrong
16. A. happens B. develops C. exists D. appears
17. A. settling B. working out C. answering D. dealing
18. A. no B. still C. less D. plenty of
19. A. about B. in C. out D. for
20. A. working B. suggesting C. spending D. waiting
查看习题详情和答案>>If you visit a big city anywhere in the world,you will probably find a restaurant which serves the food of your native country.Most large 1 in the United States offer an international sample of 2 .Many people enjoy eating the food 3 other nations.This is probably one reason 4 there are so many different kinds of restaurants in the United States.A second is that Americans 5 from all the parts of the world.They enjoy tasting the foods of their 6 lands.
In the city of Detroit, 7 ,there are many people from Western Europe,Latin America 8 the Far East.There are many restaurants in Detroit 9 serve the foods of these areas.There are many
10 international restaurants,too.Americans not only like the foods in these restaurants but also enjoy the chance to 11 understand the foreign people and their 12 of life.
One of 13 most common international restaurants to be 14 in the US is an Italian restaurant.The restaurant is a small business 15 by a single family.The mother of the 16
cooks all the dishes and the 17 and children serve the customers who come to eat there.Or it may be a 18 restaurant which can 19 many customers during one evening.So a restaurant may be owned 20 one family,one person,or by several different people who work together in the business.
1.A.cities B.countryside C.nations D.families
2.A.waiters B.restaurants C.foods D.cooks
3.A.about B.of C.on D.with
4.A.as B.when C.which D.why
5.A.arrive B.come C.go D.leave
6.A.garden B.country C.state D.native
7.A.as B.like C.for example D.such as
8.A.and B.with C.of D.then
9.A.where B.which C.when D.why
10.A.other B.others C.another D.other’s
11.A.worse B.better C.hardly D.more
12.A.hope B.wish C.place D.way
13.A.the B.a C.this D.that
14.A.cooked B.enjoyed C.found D.eaten
15.A.built B.run C.driven D.lived
16.A.family B.city C.business D.restaurant
17.A.mother B.guests C.visitors D.father
18.A.small B.large C.tiny D.bad
19.A.deal B.work C.serve D.prepare
20.A.by B.with C.of D.for
查看习题详情和答案>>
第二节 完型填空(共20小题；每小题2分，满分40分)
阅读下列短文，掌握其大意，然后从36～55各题的四个选项(A，B，C和D)中选出能填入相应空白处的最佳选项。并将答案写在答题卡上。
Shopping habits in the United States have changed greatly in the last quarter of the 20th century. 36 in the 1900s most American towns and cities had a Main Street. Main Street was always in the heart of a town. This street was 37 on both sides with many 38 businesses. Here, shoppers walked into stores to look at all sorts of merchandise: clothing, furniture, hardware, groceries. 39 ,some shops offered 40 .These shops included drugstores, restaurants, shoe-repair stores, and barber or hairdressing shops. 41 in the 1950s, a change began to 42 .Too many automobiles had crowded into Main Street 43 too few parking places were 44 shoppers. Because the streets were crowded, merchants began to look with interest at the open spaces 45 the city limits. Open space is what their car-driving customers needed.
And open space is what they got 46 the first shopping centre was built. Shopping centres, or rather malls, 47 as a collection of small new stores 48 crowded city centres. 49 by hundreds of free parking space, customers were drawn away from 50 areas to outlying malls. And the growing 51 of shopping centres led 52 to the building of bigger and better?stocked stores. 53 the late 1970s,many shopping malls had almost developed into small cities themselves. In addition to providing the 54 of one stop shopping, malls were transformed into landscaped parks, 55 benches, fountains, and outdoor entertainment.
36.A.As early as B. Early C. Early as D. Earlier
37.A.built B.designed C.intented D.lined
38.A.varied B.various C.sorted D.mixed up
39.A.Apart from B.However C.In addition D.As well
40.A.medical care B.food C.cosmetics D.services
41.A.suddenly B.Abruptly C.Contrarily D.But
42.A.be taking place B.take place C.be taken place D.have taken place
43.A.while B.yet C.though D.and then
44.A.available for B.available to C.used by D.ready for
45.A.over B.from C.out of D.outside
46.A.when B.while C.since D.then
47.A.started B.founded C.set up D.organized
48.A.out of B.away from C.next to D.near
49.A.Attracted B.Surprised C.Delighted D.Enjoyed
50.A.inner B.central C.shopping D.downtown
51.A.distinction B.fame C.popularity D.liking
52.A.on B.in turn C.by turns D.further
53.A.By B.During C.In D.Towards
54.A.cheapness B.readiness C.convenience D.handiness
55.A.because of B.and C.with D.provided