填空题

A temperature inversion occurs when______.

【参考答案】

air close to the earth is cooler than the air above it
......

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The ozone layer in the stratosphere______.
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.
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