更多"Do you know why different animals o"的相关试题:
[单项选择]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 liq
A. are small animals
B. are easily found by birds
C. are dangerous to their enemies
D. change their colors to protect themselves
[填空题]Why do people work Undoubtedly you have periodically asked yourself the same question, perhaps focused on why you have to work. "Self-interest" (26) , including the interests of family and friends, is a basic (27) for work in all societies. But self-interest can involve more than providing for existence or (28) wealth. Studies show that the vast majority of Americans would continue to work even if they (29) enough money to live comfortably.
When people work, they gain a contributing place in society. The fact that what they receive pays for their work (30) that what they do is needed by other people and that they are a necessary part of the social fabric. Work is also a major social (31) for placing people in the larger social structure and for providing them with identities. In the United States, it is a blunt and (32) public fact that to do nothing is to be nothing and to do little is to be little. Wo
