In nature, you may see many insects (昆虫）and animals of different colors. Have you ever wondered why?

   Locusts are super delicious food for birds,but it is not always an easy job for birds to catch them.It is neither because locusts are good jumpers or runners nor because they are smarter than their enemies. The reason is that the colors of locusts change with the colors of crops(庄稼). When crops are young,locusts look green. But when autumn comes, locusts change to the yellow and brown color as crops do.

   Brown bears,tigers and other animals move quietly through forests. They can’t be seen easily by their enemies. This is because they have colors similar to the trees. For the same reason, polar bears that live on a land of snow and ice are white. Butterflies and bees living among the flowers are colorful like flowers. Soil insects are mostly dark-colored and they live under the soil(土壤） in a dark and wet environment. However, insects with colors different from plants can easily be found and eaten by others. So in order to survive,they have to hide themselves in the daytime and appear only at night.

   Have you ever noticed some even stranger acts? The ink fish in the sea can send out some very black ink when it faces danger. As the ink spreads over , its enemies will find themselves suddenly in a dark world. At the same time the ink fish immediately swims away. That is how it keeps itself safe though it is not strong at all.

1.It is not easy for birds to catch locusts because____________.

A .locusts are good runners                B. locusts can jump very high

C. locusts are smarter than birds            D. locusts can change their color

2.According to the passage, most soil insects_________

A.do not have bright colors

B. change their colors with the soil

C. do not live in a dark and wet environment

D. Eat colorful insects like butterflies and bees

3.What’s the meaning of the underlined word”survive” in the passage?

A. 繁殖            B. 产卵              C. 觅食               D. 生存

4.The ink fish_______so that its enemies will not see it?

A. changes its color                   B. makes the water around it black

C. appears only at night               D. hides itself in the sea rocks

5.What is the main idea of this passage?

A. Some insects and animals have different skills.

B. Some insects and animals are clever than we think.

C. Some insects and animals use colors to protect themselves.

D. Some insects and animals can get used to the environment easily.

In nature, you may see many insects (昆虫）and animals of different colors. Have you ever wondered why?
Locusts are super delicious food for birds,but it is not always an easy job for birds to catch them.It is neither because locusts are good jumpers or runners nor because they are smarter than their enemies. The reason is that the colors of locusts change with the colors of crops(庄稼). When crops are young,locusts look green. But when autumn comes, locusts change to the yellow and brown color as crops do.
Brown bears,tigers and other animals move quietly through forests. They can’t be seen easily by their enemies. This is because they have colors similar to the trees. For the same reason, polar bears that live on a land of snow and ice are white. Butterflies and bees living among the flowers are colorful like flowers. Soil insects are mostly dark-colored and they live under the soil(土壤） in a dark and wet environment. However, insects with colors different from plants can easily be found and eaten by others. So in order to survive,they have to hide themselves in the daytime and appear only at night.
Have you ever noticed some even stranger acts? The ink fish in the sea can send out some very black ink when it faces danger. As the ink spreads over , its enemies will find themselves suddenly in a dark world. At the same time the ink fish immediately swims away. That is how it keeps itself safe though it is not strong at all

1. 1.

   It is not easy for birds to catch locusts because____________

   1. A.
      locusts are good runners
   2. B.
      locusts can jump very high
   3. C.
      locusts are smarter than birds
   4. D.
      locusts can change their color
2. 2.

   According to the passage, most soil insects_________

   1. A.
      do not have bright colors
   2. B.
      change their colors with the soil
   3. C.
      do not live in a dark and wet environment
   4. D.
      Eat colorful insects like butterflies and bees
3. 3.

   What’s the meaning of the underlined word”survive” in the passage?

   1. A.
      繁殖
   2. B.
      产卵
   3. C.
      觅食
   4. D.
      生存
4. 4.

   The ink fish_______so that its enemies will not see it?

   1. A.
      changes its color
   2. B.
      makes the water around it black
   3. C.
      appears only at night
   4. D.
      hides itself in the sea rocks
5. 5.

   What is the main idea of this passage?

   1. A.
      Some insects and animals have different skills
   2. B.
      Some insects and animals are clever than we think
   3. C.
      Some insects and animals use colors to protect themselves
   4. D.
      Some insects and animals can get used to the environment easily

完形填空

先阅读短文，掌握其大意，然后从A、B、C、D四个选项中选出一个可以填入相应空白处的最佳答案．

　　There are seas, lakes and forests on the earth. There are cities, towns and farms, 1 . All these things are environments(环境). The environment is everything around you. It can be living(有生命的), like a forest. It can be non-living(无生命的), 2 a rock or a mountain.

　　No living thing can live 3 . Every living thing depends(依靠) on 4 things in its environment. When something 5 , it affects(影响) something else. If a non-living thing like water becomes 6 to find, plants will be affected. If all plants 7 , the animals that eat plants will be affected.

　　Weather, such as(例如) temperature, wind and rain, can change an environment. 8 can change an environment, too. Some things that people do cause(引起) 9 change or only a small change in the environment. For example, people can 10 the forest and just travel around. They can cut down only a few trees and 11 change the environment very much. On the other hand(另一方面), some things that people do cause 12 change. Sometimes they can change 13 environment by cutting down a forest.

　　 14 changes are bad. If we cut down a forest to build houses or plant crops(庄稼), this may not be 15 . But what would happen if we cut down all trees in all forests 16 these things or if we didn't 17 some and plant something else?

　　It is clear that people are able to 18 an environment. This is why it is important to think about the changes before we make 19 . Let's all work together to 20 it clean and healthy.

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