单项选择题

The underlined word "longevity" in the second paragraph probably refers to ______.

A．health
B．long life
C．ageing
D．effect
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单项选择题
The text mainly talks about ______.
A．men's heart cells
B．women's ageing process
C．the gender difference
D．hearts and long life
单项选择题
According to the study, women live longer than men is probably because ______.
A．women do more exercise to keep heart healthy than men
B．women have more cells than men.
C．ageing takes less loss on women's hearts than on men's
D．women's hearts don't lose cells with age.
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