Some plants live together in a beneficial relationship of symbiosis. The fungus (真菌类植物) does not have chlorophyll (叶绿素) that plants need to make food. However, green algae does contain chlorophyll. It is, therefore, able to feed the fungus along with itself. But nothing is free! The fungus repays it by protecting the algae. Since it takes in and stores water, it can provide the algae with a non­ending water supply.

　　1．Why does the pilot fish swim beside the shark?

　　A．Because he likes eating the waste given off by the shark.

　　B．Because he can help the shark get food.

　　C．Because he can get food and protection.

　　D．Because he needs the help of the shark to lead his way.

　　解析：选C　细节理解题。根据第二段中的“When the shark eats, the pilot fish gets the leftovers. And the pilot fish needn't worry about his safety.”可知，答案为C。

　　2．To repay the sea anemone, the striped clown fish ________.

　　A．paralyzes small fish for him

　　B．helps him catch other fish

　　C．does some cleaning work

　　D．warns him of the danger

　　解析：选B　细节理解题。根据第三段中的“To pay for his safety, the clown fish brings food to the anemone. He also guides other fish into the anemone's deadly trap.”可知，答案为B。

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