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

       A．Warned, followed                                B．Warning, following

       C．Having warned, to follow                     D．Having been warned, following

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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.

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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.

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[　　]

A．were all famous scientists of great achievements

B．died of radioactivity

C．knew little about radioactivity

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[　　]

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[　　]

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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