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, following D. Having been warned, following 题目和参考答案——青夏教育精英家教网—

题目内容

__________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, following D. Having been warned, following

【答案】

【解析】考察非谓语动词，第一空和第二空都是作状语，第一空的warn与后面的逻辑主语之间是被动关系，所以排除BC,第二空的follow与他的逻辑主语 a friend 之间是主动关系，所以选择following，排除A，所以选择D

句意为，已经被警告晚上马路上很危险，她需要有一个朋友跟她一起回家。

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　　Radioactivity is dangerous. It may cause skin burns; it may destroy 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 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