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问题 选择题

我国钨资源矿产丰富。由黑钨矿提取钨发生的反应之一为：3H2+WO3W+3H2O。 其基本反应类型是[ ]

A.化合反应

B.分解反应

C.置换反应

D.复分解反应

答案

答案：C

填空题

根据括号内的汉语提示，完成句子。(每空一词)

1. The young man found it difficult to have dinner because some of his _____ (牙齿)had been pulled out.

2. Tom and Linda have been _____ (结婚) for ten years, butthey've never quarreled.

3. If you want to become a good Marathon athlete, you must practice _____ (跑步) every day.

4. He manages over 100 big companies, He is considered to be one of the most _____ (成功的)

    business men in China.

5. Their answers to the question were not the same, that's to say, they answered the question

    _____ (不同地).

6. When you communicate with your American e-pal on the internet, the e-mails are supposed to

    be _____(写) in English.
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单项选择题

下列选项中水门汀是（）

A.无机非金属修复材料

B.无机金属修复材料

C.有机非金属修复材料

D.有机金属修复材料

E.以上均不是
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