从所给的四个选项中选择最佳答案

—______ I swim in the river?

—No, you _______．There _______ be crocodiles in it．　　　

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A．Can, mustn't, may　　　B．Must, needn't, may

C．May, may not, can　　　D．Need, can't, must

　　Swimming is very popular in summer. People like swimming in summer because water makes people feel cool. If you like swimming but swim in a wrong place, it may not be safe（安全的）.These years, quite some people died（死）while they were enjoying themselves in the water and most of them were students. But some people are still not careful in swimming. They often think they swim so well that nothing can happen（发生）to them in water. Summer is here again. If you go swimming in summer, don’t forget that better swimmers have died in water. They died because they were not careful, not be-cause they could not swim. So don’t get into water when you are alone（独自）. If there is a“No Swimming”sign, don’t get into water, either. If you remember these, swimming will be safer.

根据内容判断正误，正确打“T”，错误打“F”。

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(5) “No Swimming”means“People mustn’t swim here.”