题目

 What do you do when it _____? --- I often stay at home and read books. A. raining        B. rain       C. rains            D. is rains 答案：C（2012?苏州）妈妈从水果店买回2.5千克苹果和3千克香蕉．已知苹果每千克12元，香蕉每千克6.8元．妈妈买这两种水果共花了多少元钱？