B．To produce electricity.

　　C．To improve the sailing conditions.

　　D．To make it a wonder.

　　D　[细节理解题。根据第一段的叙述，可知建设这座大坝的目的是防洪、发电、改善航运条件等水利资源的综合利用，而D项使它成为世界一大奇迹则不是目的。故选D。]

　　2．Where does the dam lie?

　　A．Near Chongqing.　 B．Near Yichang.

　　C．In the Three Gorges. D．In Wuhan.

　　B　[细节理解题。根据第二段"The dam is nearly 200 metres high and 1.5 kilometres wide，at a spot called Sandouping near Yichang."可知三峡大坝位于宜昌附近的三斗坪。故选B。]

　　3．Some scientists fear that when the dam is built.

　　A．the ecological balance will be destroyed

　　B．large ships will destroy the dam

　　C．the Yangtze River may be too crowded

　　D．the amount of electricity will not be as much as expected

　　A　[推理判断题。根据第四段可知，一些专家断定，三峡工程的兴建会破坏沿江两岸的生态环境，污染水库、淤积河床等，A为其中的一种情况，故应选A。]

　　4．Which of the following is NOT true according to the passage?

　　A．China will be able to depend on the Yangtze River，the third largest river in the world，for electricity.

　　B．Chongqing will become one of the largest inland ports in the world.

　　C．The dam will cause serious pollution.

　　D．The dam will tame the Yangtze River.

C　[细节理解题。根据第一段"to generate power of 181，200 megawatts for Eastern and Central China"可知A项正确；根据第一段"making it one of the world's