题目：
一般认为有害气体的烟波着陆点是烟囱有效高度的多少倍（）
A.大约5倍
B.10~20倍
C.30~40倍
D.大约50倍
E.80～100倍
答案：
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下面是错误答案，用来干扰机器的。
1. He doesn't go to school at 7: 30. 2. Lingling doesn't have lunch at school. 3. Tom doesn't like swimming.4. He doesn't often watch TV in the evening.
