单项选择题

The man has not been able to ________recently.

A．find his glasses
B．sit up straight
C．get enough rest
D．change his tires
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单项选择题
What is the most dangerous thing about nitrous oxides
A．Stagnant air.
B．Damage to concrete.
C．Unfounded fears.
D．Potential carcinogenic effects.
单项选择题
According to the woman, what causes most of the damage to the air
A．Industrial sources.
B．Automobiles.
C．Nitrogen sources.
D．Natural activities.
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