of danger in the street at night, she had to go home with a friend        her.

   A. Warned; accompanied               B. Having warned; accompanying

C. Warning; accompanying                    D. Having been warned; accompanying   

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科目：高中英語 來源：典中點(diǎn)綜合應(yīng)用創(chuàng)新題高二英語 題型：050

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　　Radioactivity is dangerous. It may cause skin burns; it may destroy good tissues (組織) 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 (紅腫) and the skin was peeling off. Henry Becquered carried a small tube with radium in it in his waistcoat pocket, and was surprised to find a burn on his chest. Other early workers also reported burns and harm of different kinds.

　　The strange fact that it can harm without causing pain is the warning 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 harmfulness that radioactivity produces may not appear for weeks. A person may have been hurt without knowing it for some time .

1．Which is the topic sentence?

[　　]

A．Radioactivity May Even Cause Death.

B．Radioactivity Does Great Harm to Children.

C．Radioactivity May Do Harm to People without Being Known.

D．Radioactivity is Dangerous.

2．A few people were mentioned in the passage .They ________.

[　　]

A．were all famous scientists of great achievements

B．died of radioactivity

C．knew little about radioactivity

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

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

4．The latter part of the passage is mainly written about ________.

[　　]

A．the danger to be with the radioactive materials

B．how scientists are selflessly devoted to science, in face of danger

C．the danger of radioactivity lies mainly in its being unseen and unknown for a time

D．burns and harm of all kinds that may dangerously happen around us

5．The sentence in the fourth line of the second paragraph, “the skin was peeling off” means “the skin was ________”.

[　　]

A．coming off
B．turning off
C．breaking away
D．fleeing

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