单项选择题

A．They are encouraged to do maintenance for the training centre.
B．Most of them get paid for their work.
C．They have to cook their own meals.
D．They can choose to do community work.
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单项选择题
A．They may let out more oxygen which people need.B．They can absorb different kinds of the harmful indoor chemicals.C．They can take in all kinds of indoor pollutants.D．They can make your house prettier and safer.
A．They may let out more oxygen which people need.
B．They can absorb different kinds of the harmful indoor chemicals.
C．They can take in all kinds of indoor pollutants.
D．They can make your house prettier and safer.
单项选择题
A．Between 20,000 and 40,000.B．Only one.C．7.6 million.D．49.
A．Between 20,000 and 40,000.
B．Only one.
C．7.6 million.
D．49.
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