单项选择题

The best title for above article is

A．"why men lack capacity for exercise over the years"
B．"how men's bones are arranged differently from women".
C．"studies on differences and similarities between men and women".
D．"men and women: some differences".

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单项选择题

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.

单项选择题

Which of the following statements is NOT true according to the passage

A．More oxygen needs to be prepared when a man is having surgery.
B．Man's courage has nothing to do with male's body structure.
C．A woman usually stays cooler in summer and warmer in winter.
D．It is easier for a man to lose his weight.