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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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

According to the passage, the writer looks upon the antismoking wall-builders' action ______.

A．optimistically
B．pessimistically
C．unconcernedly
D．skeptically