When a the house, they found something unusual, so they stopped to have a look. 题目和参考答案——青夏教育精英家教网—

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When a___________the house, they found something unusual, so they stopped to have a look.

approaching

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Deserts are found where there is little rainfall or where rain for a whole year falls in only a few weeks’ time. Ten inches of rain may be enough for many plants to survive （存活）if the rain is spread throughout the year, If it falls, within one or two months and the rest of the year is dry, those plants may die and a desert may form.

Sand begins as tiny pieces of rock that get smaller and smaller as wind and weather wear them down. Sand dunes （沙丘） are formed as winds move the sand across the desert. Bit by bit, the dunes grow over the years, always moving with the winds and changing the shape. Most of them are only a few feet tall, but they can grow to be several hundred feet high.

There is, however, much more to a desert than sand. In the deserts of the southwestern United States, cliffs （悬崖） and deep valleys were formed from thick mud that once lay beneath a sea more than millions of years ago. Over the centuries, the water dried up. Wind, sand, rain, heat and cold all wore away at the remaining rocks. The faces of the desert mountains are always changing – very, very slowly – as these forces of nature continue to work on the rock.

Most deserts have a surprising variety of life. There are plants, animals and insects that have adapted to life in the desert. During the heat of the day, a visitor may see very few signs of living things, but as the air begins to cool in the evening, the desert comes to life. As the sun begins to rise again in the sky, the desert once again becomes quiet and lonely.

60. Many plants may survive in deserts when__________________.

A. the rain is spread out in a year B. the rain falls only in a few weeks

C. there is little rain in a year D. it is dry all the year round

61. Sand dunes are formed when___________________.

A. sand piles up gradually B. there is plenty of rain in a year

C. the sea has dried up over the years D. pieces of rock get smaller

62. The underlined sentence in the third paragraph probably means that in a desert there is____________.

A. too much sand B. more sand than before

C. nothing except sand D. something else besides sand

63 It can be learned from the text that in a desert ____________.

A. there is no rainfall throughout the year B. life exists in rough conditions

C. all sand dunes are a few feet high D. rocks are worn away only by wind and heat

Many animals recognize their food because they see it. So do humans. When you see an apple or a piece of chocolate you know that these are things you can eat. You can also use other senses when you choose your food. You may like it because it smells good or because it tastes good. You may dislike some types of food because they do not look, smell or taste very nice. Different animals use different senses to find and choose their food. A few animals depend on only one of their senses, while most animals use more than one sense.

Although there are many different types of food, some animals spend their lives eating only one type. The giant panda eats only one particular type of bamboo. Other animals eat only one type of food even when given the choice. A kind of white butterfly will stay on the leaves of a cabbage, even though there are plenty of other vegetables in the garden. However, most animals have a more varied diet. The bear eats fruits and fish. The fox eats small animals, birds and fruits. The diet of these animals will be different depending on the season.

Humans have a very varied diet. We often eat food because we like it and not because it is good for us. In countries such as France and Britain, people eat foods with too much sugar. This makes them overweight, which is bad for their health. Eating too much red meat and animal products, such as butter, can also be bad for the health. Choosing the right food, therefore, has become an area of study in modern life.

We can infer from the text that humans and animals .

A. depend on one sense in choosing food B. are not satisfied with their food

C. choose food in similar ways D. eat entirely different food

Which of the following eats only one type of food?

A. The white butterfly. B. The small bird.

C. The bear. D. The fox.

Certain animals change their choice of food when ________.

A. the season changes B. the food color changes

C. they move to different places D. they are attracted by different smells

We can learn from the last paragraph that _________.

A. food is chosen for a good reason

B. French and British food is good

C. some people have few choices of food

D. some people care little about healthy diet

Which of the following statements is true?

A. Animals often use senses to eat their food.

B. Most animals have a more varied diet.

C. All animals spend their lives eating one type of food.

D. The diet of birds and fox will be the same depending on the season.

根据下列句子及所给单词的首字母或中文意思，在答题卷上按题号写出各单词的完全形式,注意单词形式的变化 (每空限填一词)。
【小题1】After years of hard work, he finally a________ great success.
【小题2】The trip to Xiamen cost us five thousand yuan, but I think it was w___________.
【小题3】Those who are c_______ with their life are more likely to live a happy life.
【小题4】She is an o__________ scientist, for she has made great contributions to her country.
【小题5】Although the teacher didn’t mention any names, everybody knew who he was r________ to.
【小题6】John, o________ the difficulty! Don’t give up.
【小题7】The method of r____________ the teaching cost has been discussed at the meeting.
【小题8】We are all inspired by the encouraging speech d____________ by our president.
【小题9】He was p __________ by his parents for telling lies.
【小题10】When a _________ the house, they found something unusual, so they stopped to have a look.

A black hole is a place in space where gravity pulls so much that even light cannot get out. The gravity is so strong because matter has been squeezed into a tiny space. This can happen when a star is dying.

Because no light can get out, people can’t see black holes. Space telescopes with special tools can help find black holes. The special tools can see how stars that are very close to black holes act differently from other ones.

Black holes can be big or small. Scientists think the smallest black holes are as small as just one atom. These black holes are very tiny but have the mass of a large mountain. Mass is the amount of matter, or “staff”, in an object.

Another kind of black hole is called “stellar”(星球黑洞). Its mass can be up to 20 times more than the mass of the sun. There may be many stellar mass black holes in Earth’s galaxy. Earth’s galaxy is called the Milky Way.

The largest black holes are called “supermassive”(超大质量黑洞). These black holes have masses that are more than one million suns together. Scientists have found proof that every large galaxy contains a supermassive black hole at its center. The supermassive black hole at the center of the Milky Way galaxy has a mass equal to about four million suns and would fit inside a very large ball that could hold a few million Earths.

Scientists think the smallest black holes formed when the universe began. Stellar black holes are made when the center of a very big star falls in upon itself, or falls apart. When this happens, it exploded part of the star into space. Scientists think supermassive black holes were made at the same time as the galaxy they are in.

A black hole can not be seen because strong gravity pulls all of the light into the middle of the black hole. But scientists can see how the strong gravity affects the stars and gas around the black hole. Scientists can study stars to find out if they are flying around, or orbiting a black hole.

When a black hole and a star are close together, high-energy light is made. This kind of light cannot be seen with human eyes. Scientists use satellites and telescopes in space to see the high-energy light.

1.The gravity of a black hole may become so strong that light cannot get out when ____________.

A. the star is going to die

B. special tools are used on it

C. other stars come close to it

D. it is seen from the space telescopes

2.According to the passage, which of the following is NOT true?

A. A black hole can be very tiny but extremely heavy.

B. The gravity of a black hole holds all light in its center.

C. Scientists observe high-energy light through their own eyes.

D. Some small black holes came into being as early as the universe.

3.The underlined word “galaxy” in Paragraph 5 means __________.

A. a black hole B. the Milky Way

C. a series of stars D. a planet near the earth

4.What does the last sentence in Paragraph 5 suggest?

A. Neither the sun nor the earth is as heavy as a black hole.

B. There is a supermassive black hole at the center of the Milky Way.

C. The supermassive black hole had existed before the Milky Way was formed.

D. There is a reason why the large black holes are called “supermassive”.

5.The last two paragraph mainly focus on the question of _________.

A. what a black hole is

B. how black holes form

C. how big black holes are

D. how scientists know about black holes

第三部分：阅读理解（共20小题；每小题2分，共40分）

阅读下列短文，从每题所给的A、B、C、D四个选项中，选出最佳选项，并在答题卡上将该项涂黑。

We cannot feel speed. But our senses let us know that we are moving. We see things moving. We see things moving past us and feel that we are being shaken.

We can feel acceleration, an increase in speed. But we notice it for only a short time. For instance, we feel it during the takeoff run of an airliner.

We feel the plane’s acceleration because our bodies do not gain speed as fast as the plane does. It seems that something is pushing us back against the seat. Actually, our bodies are trying to stay in the same place, while the plane is carrying us forward.

Soon the plane reaches a steady speed. Then, because there is no longer any change in speed, the feeling of forward motion stops.

56. We can feel that we are moving by _____.

A. watching things move past B. feeling the speed

C. feeling ourselves being shaken D. both A and C

57. In the second paragraph, the underlined word “ acceleration” means _____.

A. an increase in speed B. a steady speed

C. any kind of movement D. the movement of a plane

58. During the takeoff of a plane, we feel that we are being _____.

A. thrown forward B. pushed back against the seat

C. lifted out of the seat D. pushed down into the seat

59. We feel the plane’s acceleration because our bodies gain speed _____.

A. just as fast as the plane B. faster than the plane

C. more slowly than the plane D. before the plane

60. This feeling stops when _____.

A. the plane stops climbing B. the plane lands

C. there is no longer a change in speed D. we begin to feel speed

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