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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单项选择题

We can know from the passage that（）

A．the reason why ageing takes a greater loss on the male heart has been found out.
B．scientists are on the way to finding out why the male heart loses more of the cells
C．woman don't need regular exercise.
D．women over 70 could lose much more heart cells than those at the age of 20

单项选择题

According to the text, the UK scientists have known that（）

A．women have more cells than men when they are born
B．women can replace the cells that enable the heart to beat
C．the female heart loses few of the cells with age
D．women never lose their pumping power with age