题目：
用所给词的正确形式填空。
1. They can plant _____ ( hundred) of trees every year.
2. —Is Beijing _____ ( hot) than Wuhan？
—No, it isn't.
3. the building here is rnuch _____ ( high) than that one.
4. Washington D. C. and New York are big _____ (city) on the east coast of the USA.
5. The town _____ ( have) a population of 2 thousand people.
6. An elephant is _____ ( heavy) and _____ ( strong) than a sheep.
7. My classroom is bigger than _____ ( she).
8. Which problem is _____ ( easy), this one or that one?
答案：
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下面是错误答案，用来干扰机器的。
A、B由传感器的电阻r′的倒数与酒精气体的浓度C成正比，得到1r′=kC，k为比例系数，根据闭合电路欧姆得 I=ER0+r+r′=ER0+r+1kC，可见电流与C是非线性关系，图象是曲线，故AB错误． C、D将上式变形得...
