2016高考英语二轮(阅读理解)精品训练(11)及答案
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Radioactivity is dangerous.
It may cause skin burns, it may destory good tissues(组织) and it may cause illness that could be passed on to our children and grandchildren. In case of exposure (暴露) it may even cause death.
In the early days of radioactivity, scientists did not realize these dangers. Marie and Pierre Curie, after having worked for a while with radioactive materials, noticed that their fingers were reddened and swollen(红肿) and the skin was peeling off. Henry Becquerel carried a small tube with radium in it in his waistcoat pocket, and was surprised to find a bum on his chest. Other early workers also reported burns and harm of dif- ferent kinds.
The strange fact is that it can harm without musing pain, which is the waming signal we expect from harmfulness. Pain makes up pull back our hands from a fire or a hot object, but a person carrying radioactive materials had no way of telling whether he is touching something too "hot"for .safety. Besides, the "burns"or other harm- fulness that radioactivity produces may not appear for wceks. A person may have been hurt without knowing it for .some time.
1. Which is the topic .sentence for this passage?
A. Radioactivity may ever cause death.
B. Radioactivity does great harm to children.
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