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Many desserts are covered in sand. But some have mountains, rocks, or lakes that have dried up in the heat. The Great American Dessert has cliffs(悬崖) that have been made into amazing and beautiful shapes by the wind. The Sahara Desert in Africa is mostly sand. The Australian Desert has red sand.
Sometimes it does not rain for a whole year in the desert. But there is water deep under the ground and some plants have roots that go very deep to find it. Other plants have roots that spread out(延伸) a long way so they can suck up the rain as soon as it falls.
One desert plant is the cactus, which has long, spreading roots. The cactus stores water inside its hard skin. This skin protects it from heat and cold.
Camels are a bit like cactus plants! They store water too—inside their bodies. They have special fur which protects them from the sun during the day and keeps them warm at night.
Some other animals live in deserts, too. They have to be very good at seeing and hearing because most of them only come out at night. This is why many desert animals have extra big eyes or ears.
A desert fox has bigger ears than a normal for. A gerbil has huge eye, so that it can see at night. It stays cool in the day by staying underground, like most desert animals.
Some people live in the desert but they always make their homes near an oasis. An oasis is where water comes from an underground river. Near an oasis, people can grow lots of plants and keep animals.
Life is hard in the desert, for people, animals and plants. But desert people like to live there.
【小题1】A desert is very dry because__________.
| A．it is sandy | B．there is so little rain |
| C．the wind is strong | D．there is no water deep under the ground |
| A．围堵 | B．讨好 | C．释放 | D．吸收 |
| A．the sunlight is too strong in the day | B．they need to see and hear well at night |
| C．it is very cold at nigh | D．they store water in them. |
| A．storing water in side their bodies | B．drinking water as much as they can |
| C．staying underground | D．growing lots of plants |
| A．Desert people like to live in the desert though life is hard. |
| B．People in the desert usually fry eggs on the ground. |
| C．Camels have special fur to store water. |
| D．All the deserts are covered in sand. |
A. There will probably be no school on Mars.
B. It might take us two or three days to get to Mars.
C. There is a problem for us to live on Mars.
D. Food will not be the same.
E. First, people will have more space.
Many people believe that, by the year 2100, we will live on the planet Mars(火星). Here is what life could be like.
First of all, transport should be much better. By 2100, spaceship can travel at half the speed of light. 【小题1】
Secondly, humans need food, water and air to live. Scientists should be able to find plants that can grow on Mars. These plants will provide us with food and air.
【小题2】 We could easily jump too high and fly slowly away into space. To prevent this, humans on Mars have to wear special shoes to make themselves heavier.
Life on Mars will be better in many ways. 【小题3】 It is possible to live in a large building with many bedrooms. Then, robot will do most of the work, so we have more time for hobbies.
【小题4】 Every student can study, do their homework on the computer and take exams in online schools. Each student will also have their own online teacher called “e-teacher”.
However, in some ways, life on Mars may not be better than that on the earth today. 【小题5】Meals will probably be in the shape of pills(药片) and will not be as delicious as they are today. Also, space travel will make many people feel ill. 查看习题详情和答案>>
A thousand years ago Hong Kong was covered by a thick forest. As more and more people came to 1 in Hong Kong, these trees were cut down and burnt. Now there is 2 forest left, though there are still some small areas covered with trees. We call these woods.
Elephants, tigers and many 3 animals were living in the thick forest. When people came to live in Hong Kong, the 4 began to die out. Early farmers grew rice and 5 pigs and chickens in the valleys. They cut down the trees and burnt them. They needed 6 to keep themselves warm in winter, to cook their food and to keep away the dangerous animals. Elephants quickly disappeared because there was not enough food for them. So did 7 of the wolves and tigers. Monkeys and many other animals soon 8 in the same way.
You might think that there are no longer any animals in Hong Kong 9 in the zoos. But there are still about 36 different animals 10 there. One of the most interesting of Hong Kong's animals is the barking deer. These are beautiful little animals 11 a rich brown coat and a white patch (补丁) under the tail. They look like deer but they are much smaller. They are less than two feet（英尺） 12 . They make a noise rather like a dog 13 . In Hong Kong the barking deer has only a real enemy-- 14 . People hunt these little animals though it is illegal (违法的). There are now not many barking deer left. So it is important 15 people to protect wild animals.
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A. There will probably be no school on Mars.
B. It might take us two or three days to get to Mars.
C. There is a problem for us to live on Mars.
D. Food will not be the same.
E. First, people will have more space.
Many people believe that, by the year 2100, we will live on the planet Mars(火星). Here is what life could be like.
First of all, transport should be much better. By 2100, spaceship can travel at half the speed of light. 【小题1】
Secondly, humans need food, water and air to live. Scientists should be able to find plants that can grow on Mars. These plants will provide us with food and air.
【小题2】 We could easily jump too high and fly slowly away into space. To prevent this, humans on Mars have to wear special shoes to make themselves heavier.
Life on Mars will be better in many ways. 【小题3】 It is possible to live in a large building with many bedrooms. Then, robot will do most of the work, so we have more time for hobbies.
【小题4】 Every student can study, do their homework on the computer and take exams in online schools. Each student will also have their own online teacher called “e-teacher”.
However, in some ways, life on Mars may not be better than that on the earth today. 【小题5】Meals will probably be in the shape of pills(药片) and will not be as delicious as they are today. Also, space travel will make many people feel ill.
A thousand years ago Hong Kong was covered by a thick forest. As more and more people came to 1 in Hong Kong, these trees were cut down and burnt. Now there is 2 forest left, though there are still some small areas covered with trees. We call these woods.
Elephants, tigers and many 3 animals were living in the thick forest. When people came to live in Hong Kong, the 4 began to die out. Early farmers grew rice and 5 pigs and chickens in the valleys. They cut down the trees and burnt them. They needed 6 to keep themselves warm in winter, to cook their food and to keep away the dangerous animals. Elephants quickly disappeared because there was not enough food for them. So did 7 of the wolves and tigers. Monkeys and many other animals soon 8 in the same way.
You might think that there are no longer any animals in Hong Kong 9 in the zoos. But there are still about 36 different animals 10 there. One of the most interesting of Hong Kong's animals is the barking deer. These are beautiful little animals 11 a rich brown coat and a white patch (补丁) under the tail. They look like deer but they are much smaller. They are less than two feet（英尺） 12 . They make a noise rather like a dog 13 . In Hong Kong the barking deer has only a real enemy-- 14 . People hunt these little animals though it is illegal (违法的). There are now not many barking deer left. So it is important 15 people to protect wild animals.
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