The sun (set), we had to stop at the village for the night．题目和参考答案——青夏教育精英家教网—

题目内容

The sun ________(set), we had to stop at the village for the night．

答案：setting

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　　In the atmosphere, carbon dioxide acts rather like a one-way mirror or the glass in the roof of a greenhouse which allows the sun's rays to enter but prevents the heat from escaping．

　　According to a weather expert' s prediction, the atmosphere will be 3℃warmer in the year 2050 than it is today, if man continues to burn fuels at the present rate．If this warming up took place, the ice caps in the poles would begin to melt, thus raising sea level several metres and severely flooding coastal cities．Also, the increase in atmospheric temperature would lead to great changes in the climate of the northern hemisphere(北半球), possibly resulting in an alteration of the earth's chief food growing zones．

　　In the past, concern about a man-made warming of the earth has concentrated on the Arctic because the Antarctic is much colder and has a much thicker ice sheet．But the weather experts are now paying more attention to West Antarctic, which may be affected by only a few degrees of warming, in other words, by a warming on the scale that will possibly take place in the next fifty years from the burning of fuels．

　　Satellite pictures show that large areas of Antarctic ice are already disappearing．The evidence available suggests that a warming has taken place．This fits the theory that carbon dioxide warms the earth．

　　However, most of the fuel is burnt in the northern hemisphere, where temperatures seem to be falling．Scientists conclude , therefore, that up to now natural influences on the weather have gone beyond those caused by man．The question is：Which natural cause has most effect on the weather?

　　One possibility is the variable behavior of the sun．Astronomers at one research station have studied the hot spots and "cold" spots(that is, the relatively less hot spots)on the sun．As the sun rotates(使旋转), every 27.5 days, it presents hotter or "colder" faces to the earth, and different aspects to different parts of the earth．This seems to have a considerable effect on the distribution of the earth's atmospheric pressure, and consequently on wind circulation．The sun is also changeable over a long term：its heat output goes up and down in cycles, the latest trend being downward．

　　Scientists are now finding shared relations between models of solar weather interactions and the actual climate over many thousands of years, including the last Ice Age．The problem is that the models are predicting that the world should be entering a new Ice Age and it is not．One way of solving this theoretical difficulty is to assume a delay of thousands of years while the solar effects overcome the inertia(惯性)of the earth's climate．If this is right, the warming effect of carbon dioxide might thus be serving as a useful opposed balance to the sun's fading heat．

(1)

It can be concluded that a concentration of carbon dioxide in the atmosphere would ________．
[　　]
A．	mean a warming-up in the Antarctic
B．	raise the temperature of the earth' s surface
C．	prevent the sun's rays from reaching the earth's surface
D．	explain the cause of great changes in the climate in the northern hemisphere

(2)

The article was written to explain ________．
[　　]
A．	the greenhouse effect
B．	the solar effects on the earth
C．	the causes affecting weather
D．	the models of solar-weather interactions

(3)

Although the fuel consumption is greater in the northern hemisphere, temperatures there seem to be falling．This is ________．
[　　]
A．	mainly because the levels of carbon dioxide are rising
B．	partly due to changes in the output of solar energy
C．	possibly because the ice caps in the poles are melting
D．	only due to the effect of the inertia of the earth' s climate

(4)

On the basis of their models, scientists believe the opinion that ________．
[　　]
A．	the climate of the world should be becoming cooler
B．	the new Ice Age will be delayed by the greenhouse effect
C．	the man-made warming effect helps to increase the solar effects
D．	it will take thousands of years for the inertia of the earth's climate to take effect

(5)

If the assumption about the delay of a new Ice age is correct, ________．
[　　]
A．	ice would soon cover the northern hemisphere
B．	the greenhouse effect could work in favor of the earth
C．	the best way to overcome the cooling effect would be to burn more fuels
D．	the increased levels of carbon dioxide in the atmosphere could warm up the earth even more quickly

When building houses, people used to think about not only the climate of the areas but also the building materials and the fashions for their houses. However, since electricity became more and more expensive, people began to pay much more attention to the energy they could get for their houses and the new ways they could find to protect their houses from both cold and heat.

Now, houses of an old yet new type have been widely built. In some parts of the world, people share their houses with their livestock（家畜）.During cold weather, they gather their cows, goats, or other animals and keep them on the first floor of their houses. The reasons are that the animals can be protected from the cold and that they can help to heat the houses as well. The body heat given off by the animals rises to the second floor of the houses, where people live. By sharing their houses with their livestock, people gain a source of heat.

People who live in or near cities do not usually keep livestock. However, home builders use the fact that heat rises. This natural law can be used in building houses in these areas. Instead of keeping livestock on the first floor, builders fill it with large rocks. As they are open to the sun’s rays during cold weather, these rocks take in heat. They also give off the heat, and, of course, the warm air rises into the living areas of the houses. So these houses are energy-saving.

House-building becomes a great challenge（挑战）to building designers and energy engineers. They try to meet this challenge by learning from old traditions and by using modern technology. And someday in the future, people will be able to live in more energy-saving houses.

56．What did people begin to consider as electricity was no longer cheap?

A．The climate of their areas. B．The energy for their houses.

C．The fashions for their houses. D．The building materials for their houses.

57．People in some areas gain a source of heat by _________.

A．keeping their livestock downstairs

B．protecting their livestock from the cold

C．sharing their houses only with their cows

D．living on the second floor with their livestock

58．The underlined words “natural law” in the third paragraph refer to the fact that ________.

A．heat raises the temperature in the houses

B．heat goes in the upward direction

C．heat goes up if temperature is raised

D．heat increases the temperature of rocks

59．From the passage, we can conclude that __________.

A．people will no longer consider building materials in the future

B．energy-saving buildings will become more popular in the future

C．almost all people will move into the houses heated by large rocks

D．energy engineers will devote themselves only to modern technology

Travelling around the world with children is difficult enough, but attempting it without using motorized transport is even more of challenge. But Dario Schworer, a 42-year-old climatologist and mountain guide, and his 33-year-old wife Sabine are on a journey to do just that.
The Swiss couple want to travel across the world’s oceans and climb the highest mountain on every continent to promote Earth-friendly ways of life.
“We are collecting good examples of dealing with climate change and living in harmony with nature and we want to spread such ideas,” Schworer said. “We want to help people affected by global warming and to inspire children for the future.”
Recently after having spent three months teaching children in the Everest region, the couple want to show it is possible to travel through as the world’s climate zones using just human-power and forces of nature.
In the 47 countries they have visited so far they have collected 22 tons of trash, taught people in Ecuador how the sun’s rays can be used to clean water and inspired a person in Chile to build a house on water with recycled plastic bottles as a foundation. They have also collected trash in the mountains of Nepal with school children.
So far they have communicated with 45,000 children from South America, Australia and Asia, giving presentations about the importance of recycling and using alternative energy like solar and wind power.
“We need to motivate children,” said Sabine.
When they began their adventure in 2003 they had no children of their own. But since then two has become five: daughter Sabine is now five years old, Andri was born in Chile and baby Noe was born in Australia.
Initially the couple thought they would complete their travels in four years, but now, seven years later, they believe it could take seven more.
“Since our belief is the need to respect nature, we travel only when conditions are good,” Schworer said.
【小题1】Why do the Swiss couple travel around the world?

A．To inspire their children for the future.

B．To prove a travel without motorized transport.

C．To explore the secret of global warming.

D．To promote Earth-friendly ways of life.

【小题2】They did a lot during the travel except ________.

A．build a house with recycled plastic bottles

B．collect rubbish and waste

C．communicate with local children

D．show people how to use energy

【小题3】What’s the meaning of the underlined word “Initially”?

【小题4】The best title of the passage can be ________.

A．A Swiss family’ journey across the world

B．An eco-friendly adventure across the world

C．We have a long way to make a good travel

D．Nature needs respecting and protecting

Vitamin D helps bones and muscles grow strong and healthy. Low levels of vitamin D can lead to diseases such as rickets (佝偻病), mainly found in children. The thinning of bone is a common problem as people, especially women, get older.
But more and more research is suggesting that vitamin D might also help prevent many diseases. The easiest way to get vitamin D is from sunlight. The sun’s ultraviolet (紫外线的) rays react with skin cells to produce vitamin D. But many people worry about getting skin cancer and skin damage from the sun. As a result they stay out of the sun. Also, darker-skinned people produce less vitamin D than lighter-skinned people. The amount also decreases in older people and those living in northern areas that get less sunlight.
Not many foods naturally contain vitamin D. Foods high in this vitamin include oily fish and fish liveroils (鱼肝油). Farmed fish have only about one-fourth as much vitamin D as wild fish. Small amounts of vitamin D are found in beef liver, cheese and egg yolks. But most of the vitamin D in the American diet comes from foods such as milk.
Research in the last several years has shown that low levels of vitamin D may increase the risk of heart attacks in men and deaths from some cancers. More doctors are now having their patients tested for their vitamin D levels. But as research continues, some experts worry that if people take too much vitamin D, it might act as a poison. Also, skin doctors warn people to be careful with sun exposure because of the risk of skin cancer.
【小题1】The first paragraph is mainly about 　　　　.

A．the muscle diseases	B．the sources of vitamins
C．the importance of health	D．the functions of vitamin D

【小题2】Which of the following people produce the least amount of vitamin D?______

A．Elderly darker-skinned people.	B．Young lighter-skinned people.
C．Elderly lighter-skinned people.	D．Young darker-skinned people.

【小题3】 People can get the most vitamin D from 　　　　.

【小题4】What can we infer from the text?_________
A. Being exposed to sunlight is the safest way to get vitamin D.
B. Lack of vitamin D can make people age quickly.
C. Proper vitamin D levels people need are still not determined now.
D. The vitamin D level is higher in men than in women.

Dinosaurs now are far away from us. Dinosaurs were real animals that once lived on the earth, but they _1_ (die) out about 65 million years ago. The _2_(disappear) of the dinosaurs is _3_ some way a great mystery. Some scientists think that the climate changed suddenly. Fossils of trees tell us that the temperature dropped a lot and that the level of the sea dropped as well. This means that it got suddenly much _4_ (cold). Perhaps the dinosaurs were too slow __5__(change) with the climate. A new idea is _6_ a meteor(流星) crashed into the earth. Scientists discovered a place in Mexico _7_ they think the meteor crashed. They think that there was a lot of dust from the meteor. The dust landed on the plants. Also the dust blocked(阻挡)the sun’s light for as long as five years. Many animals, _8_ (include) dinosaurs, were plant eaters, and perhaps the dust killed __9___. This means there was nothing left for meat eating dinosaurs to eat, and so they died out. But, as many animals from that time did not die, we are not 100% sure what ___10__ (real) happened.

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