单项选择题

What does "meteorological experts "mean in paragraph three （）

A．predictors
B．witch
C．weathermen
D．a kind of Englishman

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单项选择题

A. I’m sorry you can’t.
B. Sure, it’s my pleasure.
C. Well, take things easy.
D. I’ll be glad to.
E. Thank you.
F. Really
G. You’re always welcome.
H. I’m sorry to hear that.

单项选择题

As pointed out at the beginning of the passage, people used to think that air pollution （） .

A．cause widespread damage in the countryside
B．affected the entire eastern half of the United States
C．had damaged effect on health
D．existed merely in urban and industries areas