题目内容
A motor home is usually owned by a family with ______ .
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Before Mr. Hagen and his wife bought a van, they ______ .
A．Mr. James Potter.B．Mr. James Potter's boss.C．Mr. James Potter's secretary.D．Mr. James
How can pests with different colors from plants keep out of danger？
Task 2
Directions: This task is the same as Task 1. The 5 questions or unfinished statements are numbered 41 through 45.
Do you know why different animals or pests 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 to protect themselves. Bears, lions and other animals move quietly through forests. They cannot be easily seen by hunters. This is because they have the colors much like the trees.
Have you ever found an even more strange act？ A kind of fish in the sea can send out a kind of very black liquid(液体)when it faces danger. While the liquid spreads over。its enemies cannot find it. And it immediately swims away. So it has lived up to now though it is not strong at all.
From the passage we learn that locusts ______ .
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