单选题
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.
【正确答案】
D
【答案解析】
解析：由第五段可知，“walls”就是指吸烟者和非吸烟者之间的隔离。
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