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.

　　C. Radioactivity may do harm to people without being known.

　　D. Radioactivity is dangerous.

　　答案：

　　2. A few people were mentioned in the passage They___________

　　A. were all famous scientists of great achievements

　　B. died of radioactivity

　　C. knew litde about radioactivity

　　D. did experiments on themselves to find the danger of radioactivity

　　答案：

　　3. According to the point of the passage, pain_________.

　　A. causes people to die

　　B. brings people suffering

　　C. is an important signal

　　D. is very much expected

　　答案：

　　4. The sentence in the third line of the second paragraph "the skin was peeling off"means

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