A．Whales' bodies are fit to swim.

　　B．People make whales' bodies suitable for swimming.

　　C．God made whales' bodies suitable for swimming.

　　D．Whales like swimming because of their shape.

　　【解析】　句意理解题。结合本句并根据第二段第一句 "These animals move well through the water."可知，该句的意思是"它们的身体适合游泳"。

　　【答案】　A

　　3．How do whales see things?

　　A．They hear the echo(回声) of the sound.

　　B．They receive the reflection of light.

　　C．They hear the sound wave produced by other animals.

　　D．They hear the sound coming from the water.

　　【解析】　细节理解题。根据最后一段第四、五两句"Then the whale hears the sounds coming back at it.This is how it sees things."可知，鲸是靠听回声来判断事物的。

　　【答案】　A

　　4．This passage is mainly written about ________．

　　A．the difference between whales and fish

　　B．the general introduction of whales

　　C．the introduction of different kinds of whales

　　D．fish and whales

　　【解析】　主旨大意题。文章介绍了鲸和鱼类的区别 、鲸繁殖的方式、听力、嗅觉等，由此可知，文章对鲸进行了全面的介绍。

　　【答案】　B

　　Ⅳ.完形填空

　　"It's nice having a friend，" said Mole (鼹鼠) to Rabbit as they sat talking in the sun one day.

"Oh, it is！" said Rabbit."Very useful, too, __1__if you need help.__2__， I