C. Some plants depend on each other for food.

　　D. Some animals live bettcr together.

　　【答案解析】

　　1.【分析】这是一道细节题。……从文中…but because they find easy food in the porasiteson sheep一句，可以得知A为正确答案。

　　2.【分析】这是一道所指题。文中第一自然段最后两句告诉我们B为最佳答案。

　　3.【分析】此题属于一道细节题，从文中…taking some of the waste products from the coral and giving in return oxygen which the animal needs to breath一句，可以得到答案为D。

　　4.【分析】此题属找中心大意题。第二段的首句属topic sentence，（主题句），并且本段通过举例珊瑚来证明动植物为了生存而相互依赖,A为本题最佳答案。本题难度适中，通过率为52％。

　　D

　　Listen carefully; we would like to tell you something that could save your precious time and money! Best of all, it is free! It’s “no”. What do you ask? We’ll say it again. “No”. Sweet and simple “no”.

　　Say “no” at your office and see how quickly that pile of work on your desk disappears. “Saying “no” to others means you are saying “yes” to yourself,” said Leslie Charles, a professional speaker from East Lansing, Michigan.

　　Susie Watson, a famous writer, said people who always say “yes” need to say “no” without guilt （内疚） or fear of punishment.

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