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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单项选择题
What was the government’ s attitude towards the demonstration
A．To approve of it.
B．To let it be.
C．To head off it.
D．To crack it down.
单项选择题
______ is NOT mentioned as a reward for volunteer activities.
A．Reference
B．Greater understanding of others
C．Great understanding of oneself
D．Opportunity to work in the community
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