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

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

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

单项选择题

It is evident that the author is NOT in favor of ______.

A．building a wall between smokers and non-smokers
B．doing scientific research at the expense of one's health
C．bringing smokers and nonsmokers together
D．providing accommodation for smokers