4．他们家族的历史能追溯到300年前。

　　The history of their family dates from/back to 300 years ago．

　　5．经过这么多年的辛苦工作，他的目标终于实现了。

　　His goal has finally come true/been realized after so many years' hard work.

　　III.阅读理解

　　The Three Gorges Dam，the largest dam，is also the largest engineering project on the face of the earth.It aims to make the mother of all floods，the Yangtze River，into a tame river，and to generate power of 181，200 megawatts for Eastern and Central China.It will form a huge，deep water lake，and make it possible for 10，000 tons ocean going ships to sail 1，500 miles inland from the Pacific to the city of Chongqing，making it one of the world's largest inland ports.

　　Construction has already started.The dam is nearly 200 metres high and 1.5 kilometres wide，at a spot called Sandouping near Yichang.

　　After many years of investigation(调研)experts have drawn a conclusion that such a grand project will do much good.It is the most important to control floods.By building hydropower plants instead of new coal plants to meet its growing demand for electricity，China will offer much in environmental protection.

　　However，some scientists don't agree to the project.They say that Chongqing and dozens of other cities along the river will pollute the reservoir，which can do harm to people，fish and other living things that depend on the river.Sedimentation(沉积)and damage of a breach(决口)are problems，too.

　　The Three Gorges Dam could be considered when it is finished，in 2009，the 8th wonder of the world.

　　【语篇解读】　本文是一篇说明文，介绍了三峡大坝的有关情况及对三峡大坝的不同评价。

　　1．Which is NOT the purpose to build such a huge dam?

A．To prevent floods.