填空题

The ozone layer in the stratosphere______.

【参考答案】

protects the earth from harmful ultraviolet radiation from t......

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单项选择题
A．She’s going away for a while.B．She did well on the test.C．She worked hard and earned a lot of money.D．She didn’t have to work hard for the exam.
A．She’s going away for a while.
B．She did well on the test.
C．She worked hard and earned a lot of money.
D．She didn’t have to work hard for the exam.
填空题
______is called black carbon pollution.
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