Swimming is very popular. People like swimming in summer because water makes people feel cool. If you like swimming and swim in a wrong place, it may not be safe. These years, a lot of people died when they were enjoying themselves in the water, and most of them were students. But some people are not careful in swimming. They often think they swim so well that nothing will happen 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 because they could not swim. So don't get into water when you are alone. If there is a "No Swimming" sign, don't get into water. If you remember these, swimming will be safer.

1.People like to swim in summer because ______.

A. it makes them strong B. they are free

C. they feel cool in water D. it is safe

2.Some swimmers die in water because ______.

A. they think they can swim well B. they are not strong enough

C. they are not careful D. they like swimming very much.

3.The writer wants to tell us ______.

A. that we must be careful in swimming B. that we should go swimming in summer

C. that swimming is a good sport D. that swimming is not safe

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科目：高中英語 來源：陜西省榆林市2017屆高三高考模擬第二次測試英語試卷 題型：閱讀理解

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“We definitely need certain research… to find out what mixtures of chemicals would be more harmful than others; what groups of chemicals, when together, would produce more harmful effects. And at the moment, that is not known.”

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