Ⅰ.教材活用——根据课文内容完成下面的短文
The Three Gorges Dam has been built to control flooding and provide hydroelectric power.The dam，nearly 200 metres high and 1.5 kilometres 1.______，is the 2._____ (large) hydroelectric power station and dam in the will.It will generate as 3.____ electricity as about 40 million tons of coal without 4.______(cause) so much air pollution.
