作引导词。

　　2．Mr．John said that Suzhou was the first city __that__ he had visited in China.

　　解析：考查关系代词。city与visit之间是动宾关系。又因为有序数词the first修饰city，故用that引导。

　　3．This is one of the best films that __have been shown__ (show) this year.

　　解析：句意：这是今年放映的最佳影片之一。films为先行词，且被放映。

　　4．He talked a lot about things and persons __that__ he remembered in the school.

　　解析：句意：他谈到了他所记起的学校的许多人和事。先行词为things and persons，只能用that。

　　5．The careless driver knocked down the old man __who/that__ was crossing the road.

　　解析：考查定语从句。句意：粗心的司机撞倒了正在过马路的老人。先行词是the old man，关系代词who/that在定语从句中作主语。

　　6．(2015·四川高考改编)The books on the desk, __whose__ covers are shiny，are prizes for us.

　　解析：考查定语从句。句意：桌子上的书是我们的奖品，它们的封面是闪亮的。由句意和句子结构可知填whose。

　　Ⅳ．阅读理解

　　阅读下列短文，从每题所给的A、B、C和D四个选项中，选出最佳选项。

　　Everybody hates rats．But in the earthquake capitals of the world-Japan, Los Angeles, Turkey-rats will soon be man's new best friends.

　　What happens after an earthquake? We send in rescue dogs．Why? Because they can smell people．Dogs save lives．They help rescuers to find living people．But dogs are big and they can't get into small spaces．So now a new research project is using a smaller animal to save lives: the rat.

How does it work? First, the rat is trained to smell people．When this happens, the rat's brain gives a signal (信号)．This is sent to a small