5.C

　　细节理解题。根据文章第三句“The sea had eaten into the soft limestone cliffs（石灰岩） on which they had been built.”可知应选C。

　　6.B

　　细节理解题。根据第五句“Erosion（侵蚀） of the white cliffs along the south coast of England has always been a problem but it has become more serious in recent years.”以及当地居民的反应“Angry owners...”可知B为最佳选项。

　　7.A

　　推理判断题。通读全文，用排除法排除掉非事实选项B、C、D。

　　8.B

　　细节理解题。根据文中“New sea walls would cost hundreds of millions of pounds...one area to another.”可知。

　　C

　　An earthquake happens when two plates rub（摩擦） together.The earth plates travel in different directions and at different speeds.If one plate is slowly forced under the other，pressure builds up until the plates break apart.This process causes the ground to move.It is an earthquake.In other words，earthquakes are the shaking of the earth’s surface caused by the earth’s rocky outer layer （岩层） as a result of the energy stored within the earth.The strain within the rocks is suddenly released （释放）.

　　The damage an earthquake causes depends on where it is and when it is happening.If an unpopulated region is struck，there will be low loss of life or property.If it hits a large city，there may be many injuries and much destruction.Many of the areas at risk are largely populated now.Major earthquakes hitting those areas today could produce terrible damage.

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