单项选择题

A．Environment.
B．Genes.
C．Parents.
D．Both A and B
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单项选择题
We can conclude from the passage that we need to control noise pollution if ______.
A．we want to stay both psychologically and physically healthy
B．we don' t want to be physically destroyed
C．we want to cooperate well
D．we don' t want to be anxious
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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