单项选择题

A．In the coffee shop.
B．Discussing physical problem in the classroom.
C．Working on a science problem at home.
D．Reading 20th century literature in the hbrary.
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单项选择题
A．Different countries.B．Income, race and age.C．Americans.D．Both men and women who are interested in lt.
A．Different countries.
B．Income, race and age.
C．Americans.
D．Both men and women who are interested in lt.
单项选择题
It can be inferred 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 easy to make angry with others
C．we want to work hard and cooperate well with each other
D．we don't want to suffer from serious anxiety and feel uneasy
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