单项选择题

The purpose of the passage is to ______.

A．describe the harmful air pollution
B．explain the way to prevent air pollution
C．recommend a method to avoid air pollution
D．show the worries about the air pollution
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单项选择题
According to the passage, the current emergency in Mexico City refers to ______.
A．economic crisis
B．serious air pollution
C．unemployment
D．natural disaster
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