单项选择题

In paragraph 4, "you" refers to ______.

A．smokers
B．nonsmokers
C．antismokers
D．smokers who have quitted smoking
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单项选择题
As is suggested, the common solution to the common problem is ______.
A．to separate people from people
B．to work together in mutual accommodation
C．to make us keenly aware of choice
D．to serve society's interests better
单项选择题
What does the word walls in the passage mean
A．Antismoking propaganda.
B．Diseases striking nonsmokers as well as smokers.
C．Rules and regulations that prohibit smoking.
D．Separation of smokers from nonsmokers.
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