题目

Lily: Hi, Dave. Do you think the weather is fine today? Dave: Yeah. And the air is also clearer than ever before. Lily: En, the newspaper reports that the air is less and less   56   (pollute) these days. Dave: That’s true. Fewer and fewer people   57   (drive) cars to work since the government started the traffic control two months ago. Lily: But the control is going to end   58   two weeks. What will happen then? Are cars coming back to the road? Dave: That’s true, too, although we all hope   59   will never end. On the other hand, the traffic control has made 求圆锥的体积。 （1） （2）