Polar explorers have to be extremely to bear the climate and other hardships. A．difficult B．rough C．tough D．brave 题目和参考答案——青夏教育精英家教网—

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Polar explorers have to be extremely _______ to bear the climate and other hardships.

A．difficult B．rough C．tough D．brave

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Polar bears live mostly on_____ sea ice, which they use as ____platform for hunting seals.

A. a;a B.a;the C./;a D.the;/

Although the weathermen’s forecasts for a month ahead are only little better than guesswork, they are now making long-term forecasts into the next century with growing confidence. The main trend in the world’s climate in the coming years will, scientists say, be a predictable result of man’s activities.
At the start of the industrial revolution nearly two centuries ago, man set off a big experiment in planetary engineering. Unaware of what he was doing, he spared no thought for the consequences. Today the possible outcome is alarmingly clear, but the experiment is unstoppable. Within the lifetime of many of us, the Earth may become warmer than it has been for a thousand years. By the middle of this century it may be warmer than it has been since the last Ice Age.
A warmer climate may seem welcome, but it could bring many dangers： damages to crops in the world’s main food-producing areas, famine(饥荒), economic instability, civil unrest and even war.
In the much longer term, melting of the great ice-caps of Greenland and Antarctica could raise sea-levels throughout the world. The average sea-level has already risen a foot since the turn of the last century, and if the ice-caps disappear completely, it would rise by nearly 200 feet. Complete melting might take many centuries, but even a small increase in sea-level would threaten low-lying parts of the world such as the Netherlands.
44. Long-term weather forecasts beyond the year 2050 may seem strange because ____.
A. none of us will be alive then
B. weathermen can even forecast next month’s weather correctly
C. weathermen can forecast much better than they used to
D. no one can stop engineering experiments
45. Weathermen believe that our future climate will be the direct result of ____.
A. the big scientific experiment B. clever long-term forecasts
C. the melting of the ice-caps D. planets changing course
46. One of the results of a warmer world climate could be ____.
A. an increase in food production
B. greater co-operation between countries
C. the death of millions of people from starvation
D. a reduction in the amount of oil we use
47. Scientists are fairly sure that by the year 2050, _______.
A. the sea-level will have risen obviously
B. there will have been the Third World War
C. most countries will have been flooded
D. the polar ice-caps will have melted completely

Of the thousands of different kinds of animals that exist in the world man has learned to make friends with an enormous number. Some are pets, and offer him companionship; some give protection, and some do hard work which man cannot do for himself. Dogs, which serve man in all four capacities(Korea and China are big dog eaters), are found in various breeds(动物品种) in all countries of the world. The Husky can live in the cold polar regions， and the Saluki is at home in the hottest parts of Central Africa. The inhabitants of certain countries are dependent for their very lives on the camel. In the West Indies the little donkey, strong and sure-footed, carrying heavy loads even in mountainous places, is a familiar sight.
Trained and tamed for many generations, domestic animals are not accustomed to roaming in search of food and shelter. They look to their masters to provide for their needs, and as long as these are supplied, they are content to do what their masters require.
All domestic animals need proper food. It must be suitable for them, sufficient in quantity, fresh and clean. Some people feed a pet dog or cat on odds and ends of table scraps, and then wonder why the animal seems listless(倦怠的) and dull. The quantity of food depends on the size of the animal and the amount of exercise it takes. Overfeeding is as bad as underfeeding. Containers for food and water must be washed regularly if the animal is to maintain good health.
Even well cared for animals may sometimes fall ill. If this happens, the wise master seeks the best advice he can get. All sorts of medicines and treatments are available for sick animals, and in some countries organizations exist to provide them free or at a cheap price. Useful, friendly, hardworking animals deserve to have some time, money and attention spent on their health.
66．What main idea does the author want to convey in the first paragraph?
A．There exists thousands of species of animals in the world.
B．Man came to establish a close relationship with a number of animals.
C．In some regions dogs seems to be more closely related to man.
D．Most animals existing in the world are kept by humans now.
67．Which of the following is a domestic animal, according to the passage?
A．A wolf kept in a zoo.
B．A pig raised for meat.
C．A tiger performing in circus.
D．A fish living in a river.
68．Which of the following is NOT true of dogs according to the passage?
A．They can act as friends, guards, and servants to man.
B．They have great adaptation for the environment.
C．There live a great variety of breeds of dogs on the globe.
D．The Husky and the Saluki are the strongest breeds ever known in the world.
69．To keep a domestic animal physically fit, its owner is advised ____.
A．not to hesitate to spend enormous amount of money on it
B．to be wise about their feeding
C．not to allow it to take too big amounts of exercise
D．to join some sort of pet-keeping organizations
70．Which of the following would be best TITLE for this passage?
A．Domesticated Animals – Man’s Best Friend
B．Proper Diet for Healthy Animals
C．The Advantages of Raising Domestic Animals
D．Some Tips on Pet-keeping

　　When did you last see a polar bear? On a trip to a zoo, perhaps? If you had attended a winter activity in New York a few years ago, you would have seen a whole polar bear club. These "Polar Bears" are people who meet frequently in the winter to swim in freezing cold water. That day, the air temperature was 3℃, and the water temperature was a bit higher. The members of the Polar Bear Club at Coney Island, New York are usually about the age of 60. Members must satisfy two requirements. First, they must get along well with everyone else in the group, this is very important because there are so many different kinds of people in the club. Polar Bears must also agree to swim outdoors at least twice a month from November through February.
　　Doctors do not agree about the medical effects of cold-water swimming. Some are worried about the dangers of a condition in which the body's temperature drops so low that finally the heart stops. Other doctors, however, point out that there is more danger of a heart attack during summer swimming because the difference between the air temperature and water temperature is much greater in summer than in winter.
The Polar Bears themselves are satisfied with the benefits (or advantages) of cold-water swimming. They say that their favorite form of exercise is very good for the circulatory system(循环系统) because it forces the blood to move fast to keep the body warm. Cold-water swimmers usually turn bright red after a few minutes in the water. A person who turns blue probably has a very poor circulatory system and should not try cold-water swimming.
　　The main benefits(or advantages) of cold-water swimming are probably mental. The Polar Bears love to swim year-round; they find it fun and relaxing. As one 70-year-old woman says. "When I go into the water, I pour my troubles into the ocean and let them float away."
51. The members of the Polar Bear Club must meet the following requirements except that_____ .
　A. they should be easy to make friends with
　B. they must swim outdoors at least 8 times in the four cold months
　C. they must agree to swim outdoors from November through February
　D. they must reach the age of 60
52. Doctors _____ .
　A. encourage people to take part in cold-water swimming actively
　B. point out the possible danger of blood illness during cold-water swimming
　C. believe swimming is helpful both in winter and in summer
　D. have different ideas about the medical effects of cold-water swimming
53. According to the passage, some doctors believe it is true that _____ .
　A. you are healthy if cold-water swimming turns your skin color blue
　B. cold-water swimming causes more heart attacks in summer than in winter
　C. cold-water swimming can make the body temperature dangerously high
　D. Polar Bears are bears swimming in freezing water
54. The Polar Bears like to swim all the year round, for _____ .
　A. they can remain young   B. it is an easy way to keep the body warm in winter
　C. they find it enjoyable and interesting D. they might meet fewer troubles in life
55. The passage is mainly about _____ .
a group of cold-water swimming lovers                  B. the polar bears' life
　C. doctors' ideas about cold-water swimming            D. the requirements of the Polar Bear Club

Polar bears live mostly on __________ sea ice, which they use as __________ platform for hunting seals.

A. a; a ??? B. a; the? ??? C. 不填; a ???? D. the; 不填

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