问题
单项选择题 A1型题
生活饮用水中制定了三氯甲烷和四氯化碳的标准，其原因是（）
A.这两种物质可恶化水的感官性状
B.这两种物质可损害肾脏，引起人群的慢性中毒
C.二者均具有一定的致癌作用
D.进行氯化消毒时可产生氯化副产物
E.以上都不是
答案
参考答案：C
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生活饮用水中制定了三氯甲烷和四氯化碳的标准，其原因是（）
A.这两种物质可恶化水的感官性状
B.这两种物质可损害肾脏，引起人群的慢性中毒
C.二者均具有一定的致癌作用
D.进行氯化消毒时可产生氯化副产物
E.以上都不是
参考答案：C
阅读短文，根据短文内容从方框中选择恰当的句子把短文补充完整，将其代号填在答题卡相应的题号后。注意选项中有一个多余选项。
| A. he began to publish story books B. people liked his books so much C. his life is in danger D. he just got into the habit of smoking E. so he enjoys great popularity in our neighborhood |
Tom, who is a famous writer about 40 years old, lives just next door. He is kind and warm-hearted and always ready to give a helping hand to others when in need, 小题2: .
He often came to my house to tell me how to write stories and encourage me with his own experience. He told me he was born in a poor family. As a little boy, he had a dream to become a famous writer. He overcame thousands of difficulties to have entered a university. After graduation, 小题3: , and up till now, he is very famous around the country.
Unfortunately, when he was young, 小题4: and became a heavy smoker, which has ended up as an invisible killer of his health.