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题型:阅读理解-单选 难度:0.65 引用次数:683 题号:17886620

Do you know why different animals or pests (害虫) have their special colors? Colors in them seem to be used mainly 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 crops. When crops are green, locusts look green. But as the harvest time comes, locusts change to the same brown color as crops have. Some other pests with different colors from plants are easily found and eaten by others. So they have to hide themselves for lives and appear only at night.

If you study the animal life, you’ll find the main use of coloring is protecting themselves. Bears, tigers and other animals move quietly through forests. They cannot be seen by hunters. This is because they have the colors much like the trees.

Have you ever noticed an even stranger act? An octopus (章鱼) can send out a kind of very black liquid when it faces danger. While the liquid spreads over, the enemies cannot find it. And it immediately swims away. So it has lived up to now though it isn’t strong at all.

1. From the passage we learn that locusts ________.
A.are small animalsB.are easily found by birds
C.are dangerous to their enemiesD.change their colors to protect themselves
2. How can pests with different colors from plants keep out of danger?
A.They run away quickly.
B.Their colors are like their enemies’.
C.They hide themselves in the day and appear at night.
D.They have to move quietly.
3. Bears and tigers can keep safe because they ________.
A.have the colors much like the treesB.move quickly
C.like brown and grey colorsD.live in forests
4. An octopus lives up to now because ________.
A.it is very big and strong
B.the liquid it sends out helps it escape from its enemies
C.the liquid it sends out can kill its enemies
D.it swims faster than any other fish
5. Which is the BEST title for this passage?
A.The Changes of Colors for Animals and PestsB.Colors of Different Animals and Pests
C.The Main Use of Colors for Animals and PestsD.Some Animals and Pests

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Allowing pet cats to go outside is not just bad for birds and wildlife(野生动物). It is bad for the cats themselves, too. Outdoor cats can get sick very easily. They may be in danger from traffic and attacks(攻击)from other animals. In fact, outdoor cats usually don’t pass the age of five, while indoor cats often live to be 17 or older.

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