1. 听材料，回答问题。

1. （1） Where are the mother and her son?

   A . In a forest. B . Near the Yellow River. C . In Beijing.
3. （2） What's the trouble with the boy?

   A . He can't find his mother. B . There's something wrong with his eyes. C . He can't see the clock tower clearly.
5. （3） What have the people there been asked to do?

   A . To cover their faces when going out. B . Not to go out. C . To put on glasses when going out.
7. （4） What can people do to prevent sandstorms?

   A . Save water. B . Keep the balance of nature. C . Protect the animals.