Do you know why different animals or pests(害虫)have different colors? The colors are mainly used to protect themselves．

  Some birds like eating locusts(蝗虫)，but birds cannot easily catch them．Why? It is because locusts change their colors together with the change of the colors of the crops. When the crops are green，locusts look green．But as the harvest time comes，locus change to the same brown colors as the crops have．Some pests with different colors from the plants easily found and eaten by others．So they have to hide themselves，appearing only at night．

Some animals move quietly through forests．They cannot be easily seen by hunters(猎人)．This is because they have the colors much like the trees’．

    A kind of fish in the sea can send out a kind of black liquid(液体)when it faces danger．While the liquid spreads over，the fish’s enemies cannot find it．And it immediately swims away．So it has lived up to now though it is not strong at all．

1．From the passage we can learn that locusts________．

    A．are small animals                       B．are easily found by birds

    C．are dangerous for their enemies            D．can’t be easily caught by birds

2．How can pests with different colors from the plants keep out of danger?

    A．They run away quickly．

    B．They have the colors much like their enemies’．

    C．They hide themselves in the daytime and appear at night．

    D．They have to move quietly．

3．Some animals Can keep safe in the forest because________．

    A．they have the colors much like the trees’

    B．they move quietly

    C．they like brown and grey colors

    D．they live in the forest

4．Why can the kind offish in Paragraph4 live up to now(直到现在)?

    A．Because it is very large and strong．

    B．Because the liquid it sends out can help it escape when in danger．

    C．Because the liquid it sends out call kill its enemies．

    D．Because it swims very fast and Call escape very quickly．

5．Which is the best title for this passage?

    A．The Change of Colors．

    B．Colors of Different Animals and Pests．

    C．The Main Use of Colors with Animals and Pests．

    D．Some Animals and Pests．

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