单项选择题

A．Once a week.
B．Twice a week.
C．Once every three weeks.
D．Once every two weeks.
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单项选择题
A．Environment.B．Genes.C．Parents.D．Both A and B
A．Environment.
B．Genes.
C．Parents.
D．Both A and B
单项选择题
According to the passage, people ______.
A．can not work better in a noisy situation
B．will suffer from complete deafness because of noise pollution
C．can be psychologically affected by working in very noisy factories
D．may cooperate well in noisy surrounding
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