Houses fall down. Trees fall over. Large hole...

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Houses fall down. Trees fall over. Large holes form in the ground. Could Alaska be sinking? That’s what some villagers in Alaska have been asking themselves recently and scientists think they know why. Warmer temperatures may be causing Alaska’s frozen ground to thaw (解冻).

About 85 percent of Alaska’s land surface has permafrost (永久冻结带). Permafrost supports the ground above it—including trees, houses, and roads. But why is the permafrost thawing?

Some scientists say that human-caused pollution is leading to global warming. And most scientists agree that Alaska has been getting warmer. They say that the warmer temperature is causing permafrost to thaw in some areas. The thawing permafrost can cause problems for people, plants, and animals.

The collapsing (倒塌) is a problem in the villages in Alaska which are built on permafrost, and some of them may have to move to safer ground, where there is no permafrost.

The Alaskan town of Glennallen saw its old post office collapse. And, according to James Walters, a permafrost expert at the University of Northern Iowa, house-moving companies have been very busy.

“Melting permafrost can also destroy trees and forests,” Walters said. “When holes in the ground form, trees fall into them and die. This could turn a forest into a swamp (沼泽), and animals which need the forests will have to move elsewhere.”

“The melting could cause severe problems.” Walters says, “This could take hundreds of years, but in the end Alaska will look quite different from what it looks like now.”

1.The main reason why permafrost is thawing is that ______.

A. the temperature in Alaska is rising

B. people in Alaska don’t take care of permafrost

C. too many houses are built on permafrost

D. people in Alaska polluted permafrost

2.The following are the results of melting permafrost EXCEPT ______.

A. holes form in the ground

B. a forest will be turned into a swamp

C. some animals have to go elsewhere

D. more water will be needed by people and animals

3.Which of the following is NOT true according to the passage?

A. When permafrost melts, houses will fall down.

B. House-moving companies are busy because their houses are in danger.

C. To stop permafrost melting is a very difficult problem.

D. Most of Alaska’s land surface has permafrost.

4.Which of the following can be used as the best title of the passage?

A. Alaska—A Frozen Land　　 B. Pollution and Global Warming

C. Is Alaska Sinking?　　 D. Alaska Is Polluted

高二英语阅读理解中等难度题

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Houses fall down. Trees fall over. Large holes form in the ground. Could Alaska be sinking? That’s what some villagers in Alaska have been asking themselves recently and scientists think they know why. Warmer temperatures may be causing Alaska’s frozen ground to thaw (解冻).
About 85 percent of Alaska’s land surface has permafrost (永久冻结带). Permafrost supports the ground above it—including trees, houses, and roads. But why is the permafrost thawing?
Some scientists say that human-caused pollution is leading to global warming. And most scientists agree that Alaska has been getting warmer. They say that the warmer temperature is causing permafrost to thaw in some areas. The thawing permafrost can cause problems for people, plants, and animals.
The collapsing (倒塌) is a problem in the villages in Alaska which are built on permafrost, and some of them may have to move to safer ground, where there is no permafrost.
The Alaskan town of Glennallen saw its old post office collapse. And, according to James Walters, a permafrost expert at the University of Northern Iowa, house-moving companies have been very busy.
“Melting permafrost can also destroy trees and forests,” Walters said. “When holes in the ground form, trees fall into them and die. This could turn a forest into a swamp (沼泽), and animals which need the forests will have to move elsewhere.”
“The melting could cause severe problems.” Walters says, “This could take hundreds of years, but in the end Alaska will look quite different from what it looks like now.”
1.The main reason why permafrost is thawing is that ______.
A. the temperature in Alaska is rising
B. people in Alaska don’t take care of permafrost
C. too many houses are built on permafrost
D. people in Alaska polluted permafrost
2.The following are the results of melting permafrost EXCEPT ______.
A. holes form in the ground
B. a forest will be turned into a swamp
C. some animals have to go elsewhere
D. more water will be needed by people and animals
3.Which of the following is NOT true according to the passage?
A. When permafrost melts, houses will fall down.
B. House-moving companies are busy because their houses are in danger.
C. To stop permafrost melting is a very difficult problem.
D. Most of Alaska’s land surface has permafrost.
4.Which of the following can be used as the best title of the passage?
A. Alaska—A Frozen Land　　 B. Pollution and Global Warming
C. Is Alaska Sinking?　　 D. Alaska Is Polluted

高二英语阅读理解中等难度题查看答案及解析
There are over 58,000 rocky objects in ______ space, about 900 of which could fall down onto ______ earth.
A．the; the B．/; the C．the; a D．a; /

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There are over 58000 rocky objects in ______space，about 900 of which could fall down onto ______ earth.
A．the; the B．/; the C．the; / D．a; the

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In autumn, leaves turn yellow and _____ the trees.
A. fall from　　 B. fall down
C. fall off　　 D. fall out

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In late summer or early fall the large, yellow seed heads of sunflowers will be ripening. If gardeners can keep off the birds and other wildlife trying to eat the seeds, they can have a large harvest. The bright yellow blooms will make a rainbow garden, brightening up any space.
However, planting the sunflower seeds is a skilled job. Plant seeds no deeper than the full length of itself. Smaller sized sunflowers can be spaced a foot apart. Larger varieties will need to be spaced as far apart as three feet. This allows ripe plants enough space for the seed heads to ripen without knocking the ripe seeds off before gardeners have a chance to harvest them.
Most sunflower seeds, especially those with eatable seeds, are large enough to handle without the need for seed sorters. This is why sunflowers make an excellent choice for a children's garden as well. Gardeners will want to mix plenty of soil fertilizers into the ground as sunflowers tend to be heavy feeders.
Sunflowers can be slow starters and the tiny new plants don't seem to grow very rapidly. Gardeners should protect the new plants as they begin to grow. Once they get going, sunflowers are able to out-grow many weeds, making them easier to grow in the home vegetable garden than many other plants.
Most pests and diseases are not a bother to the sunflower, however, more than one gardener has said that their lovely looking plants were ravaged overnight by hungry squirrels, mice or birds. To preserve their harvest, gardeners can cover the ripening seed head with stockings or net cloth to help keep the destroyers off the seeds.
Planting sunflower seeds is easy and can help even the smallest gardener feel successful in their gardening attempts.
1.What is the passage mainly about?
A. How to plant sunflowers.　　 B. Different kinds of sunflowers.
C. Ways to preserve sunflowers.　　 D. Tips on making your garden bright.
2.Why should enough space be left between sunflowers?
A. To prevent birds from eating sunflower seeds.
B. To offer the sunflowers enough sunlight.
C. To protect the ripe seed heads before harvest.
D. To help the sunflowers grow stronger.
3.Why do children love to grow sunflowers in their garden?
A. They want to decorate their garden with sunflowers.
B. The seeds are easy to plant and unnecessary to sort.
C. Sunflowers don’t need too much soil fertilizer.
D. Tiny new sunflowers can grow very fast
4.Which of the following can replace the underlined word “ravaged” in Paragraph 5?
A. Destroyed.　　 B. Covered.
C. Surrounded.　　 D. Removed.

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.People have planted a great many trees in order to _____ wind and sand in the desert.

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The trees ___________ down in the storm have been moved off the road.
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You're rushing to work and a man ahead of you falls down on the sidewalk. Do you stop to help? In a study of by-standers, it was found that some people keep on walking.
"There is a tendency to decide that no action is needed," says a psychologist, "In order to take action, you have to work against them." Here are some common thoughts that stop you from helping.
●Why should I be the one? I'm probably not the most able person in this crowd. You might think someone older or with more medical knowledge should offer assistance.
●What if he doesn't really need my help? The fear of embarrassment is powerful; no one wants to risk looking foolish in front of others.
●No one else looks concerned. We can follow the people around us, but most people tend to hold back their emotions in public.
"If you spot trouble and find yourself explaining inaction, force yourself to stop and figure out the situation instead of walking on," says the psychologist. "Then retry to involve other people; you don't have to take on the entire responsibility of being helpful. Sometimes it's just a matter of turning to the person next to you and saying, 'It looks like we should do something.' Or asking someone if an ambulance has been called and, if not, to call for one. Once you take action, most people will follow you."
1.Which is NOT the common thought that stops you from helping others?
A. I'm not the very capable person.　　　　
B. It looks like we should do something.
C. No one else is concerned.　　　　　　　　　
D. He doesn't really need my help.
2.In order to offer your timely help, you need to　　　　　　　　　　 .
A. go directly to the police station
B. get along well with the passers-by who spot the trouble
C. ask others for help and call the police
D. work against the first thoughts that stop you from offering help
3.The main purpose of the passage is to tell readers　　　　　　　　　　　　　　　　　　　　 .
A. to give others a hand　　　　　　　　　　 B. to be more able
C. to explain their inaction　　　　　　　　　　 D. to evaluate the situation

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