题目

What were they planning to do at the weekend?A.Stay at home. B.Write a report. C.Go to the mountains. 答案：【答案】C【解析】【原文】M: Did you listen to the weather report this morning, Helen?W: Yes. It says we are going to have a wet weekend. We may get heavy rain in the mountain areas.M: That means we will have to stay in.求圆环的面积．