Which of the following is NOT a form of air pollutants?
A. Nitrogen and oxygen.
B. Automobile exhaust.
C. Factory fumes.
D. Smoke from forest fires.
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Which of the following is true about water pollution?
A. Water becomes polluted only because of chemicals from factories.
B. Waste from mines can make water safe for swimming or bathing.
C. Water animals in polluted water may carry pollutants.
D. Water animals may pass pollutants to other animals, but not humans.
Which is of the following is NOT a cause for land pollution?
A. Dumping of used plastic bags.
B. Throwing away waste food.
C. Dumping of factory-made substances.
D. Toxic waste leaking from factories.
5. Which of the following is true about noise pollution?
A. Noise pollution does not disturb our life.
B. Noise pollution has harmful effects on humans, not on animals.
C. Noise pollution can affect animals, but not humans.
D. Noise pollution can have harmful effects on both humans and animals.
下面关于框架中使用单一入口的说法，正确的是：
A. 可以节省服务器资源
B. 提高安全性
C. 可以更好地兼容路由
D. 简化代码，提高代码运行效率
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