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单选题
Small amounts of soot are safe, but large amounts can be dangerous．The govenment wants to limit this kind of pollution．It may stop people from using their fireplaces.
The air is tested every day．When soot levels are high, more than 65 micrograms of soot per cubic meter, factories must stop making smoke．The government thinks that limit should be much lower.
Factories produce the most smoke and soot．But the government thinks that all types of burning should be limited．The soot levels from factories and homes could be limited．Home owners may have to install new wood stoves that they comply with the new law．Or, they may not be able to bum on days when the air quality is bad.
Residents of some towns are fined if they violate the burning ban．Scientists hope these new regulations will make the air cleaner and less harmful to breathe.
Why is it dangerous to burn too much wood?
A
B
C
D
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答案：
解析：
燃烧过多的木材会释放有害的化学物质。文章中提到，木材燃烧产生的烟雾中含有有害的化学物质，这些化学物质以微小的颗粒形式漂浮在空气中，无法被肉眼看到，需要使用显微镜才能观察到。因此，选项C“有害化学物质被释放出来”是正确答案。
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