单项选择题

A．At the beginning of the war.
B．At the end of the war.
C．In the middle of the war.
D．It isn’’t mentioned in the passage.
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单项选择题
A．Mary herself.B．Her professor.C．Her parents.D．Her friends.
A．Mary herself.
B．Her professor.
C．Her parents.
D．Her friends.
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.
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