Question

9．17．The boy is complaining about his sight．
18．The boy can't see the clock tower clearly today．
19．There is some kind of fog in the air when it is windy．
20．There is a sandstorm and it stops people from seeing things clearly．
21．People in Beijing are warned not to go out．
22．Only two reasons lead to sandstorms in Beijing．
23．We can prevent the bad weather by protecting the forests．

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