单选题
That boys suffer more from air pollution can possibly be justified by the fact that
A、
the male have larger bones than the female.
B、
women can manufacture blood more efficiently than men.
C、
men usually breathe more deeply than women.
D、
women breathe as often as men.
【正确答案】
C
【答案解析】
[解析]从文章第一段最后一句可知：But men breathe more deeply and this exposes them to another risk．They draw more of the air when it is polluted．故应选C。
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