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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单项选择题
The Mexican government takes half measures to solve the pollution problem because ______.
A．it is not wise enough to come up with effective measures
B．Mexican economy depends very much on cars and factories
C．Mexicans are able to adapt themselves to the current emergency
D．Mexicans enjoy playing dangerous games with their health
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