What is the purpose in writing this text?

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参考答案

主旨大意题。本文作者首先介绍了山体滑坡的危害，又说明了普通的防护方法的不足，最后向大家推荐了一种新型的机器人，利用这种新型的滑坡抢险产品，可以有效地防止危害的产生。所以主要的目的是介绍一种用于加固山体的产品。

1 What does the robot look like?

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2 The biggest advantage of this product is that__________.

A．[ A ] it will be faster and cheaper than manual labor

B．[ B ] it can climb mountainsides, drill holes, insert bars and cement

C．[ C ] it can collect data on the slope' s stability

D．[ D ] it can drill without a human being on board

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3 听第下列材料，请回答题：

Which of the following gives a general idea of how the noise killing system works?

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