【简答题】阅读下面的材料,然后根据材料回答问题。 Elizabeth lived with her six children in a small house. One winter, there was a big flood (洪水), and quite a few houses were washed away, but Elizabeth's house was high enough to es...
【简答题】阅读下面的材料,然后根据材料内容回答所提问题。 You may have known several kinds of police, traffic police and street police. But have you ever heard of energysaving (节能) policemen? A group of 22 of these new policemen went ...