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Unit 4 Earthquakes

话 题 导 入

A lot of earthquakes happen in the world every year A lot of earthquakes happen in the world every year. Why do earthquakes happen? Scientists tell us the outside of the earth is made of a number of different plates (板块). The plates move very slowly. Sometimes they stop and don't move for a long time. When some of the earth's plates move suddenly, an earthquake happens. Many earthquakes happen under the sea. Sometimes they happen near mountains. In fact, earthquakes may happen anywhere on the earth. During an earthquake, the shakings make rocks rise suddenly and even break open. Houses fall. People are killed or hurt. Sometimes whole villages or cities are destroyed.

Can we do something to keep ourselves safe from earthquakes Can we do something to keep ourselves safe from earthquakes? Scientists have studied earthquakes and made maps that show“earthquake belts”. In the areas in these belts, it's possible for earthquakes to happen. In these areas we can make houses strong enough to stand against earthquakes. In the future, scientists will be able to predict (预言) exactly when and where an earthquake will happen. They can tell us what to do and how to do it as well.

判断正误(True or False) 1．Few earthquakes happen in the world every year. 2．The outside of the earth is made of a number of different plates. 3．We can do nothing to keep ourselves safe from earthquakes. 4．A map showing the earthquake belts tells people what kind of houses can stand in an earthquake. 5．In the future, scientists can predict exactly when and where an earthquake will happen.

文章大意：本文是一篇说明文，主要介绍地震形成的原因以及造成的危害，并且在将来科学家们能够精确地预言地震在何时何地发生，告诫人们做什么，如何做。 1．F　细节理解题，该题的题干中有一关键词“few”意为 “没有一些”，通过文章第一句话“A lot of earthquakes happen in the world every year.”就可以看出本题是错误的。 2．T　细节理解题。由文章的第一自然段“Scientists tell us the outside of the earth is made of a number of different plates (板块)”．可以看出，这句话是正确的。

3．F　细节理解题。由文章第四自然段，最后一句In these areas we can make houses strong enough to stand against earthquakes.可以看出，我们能够做一些事情降低地震的破坏程度。故此题错误。 4．F　细节理解题。由文章第四自然段可知，科学家画出地震带的目的是将地震带上的房子建地足够牢固可以降低地震的破坏程度，而不是哪种房子可以在地震中不倒。所以这句话是错误的。 5．T　细节理解题，由文章最后一段话“In the future, scientists will be able to predict (预言) exactly when and where an earthquake will happen”。可知这句话是正确的。