单项选择题

Dr. Goldspink disagrees with the proposal that oestrogen could protect heart because _________.

A．female sex hormone can increase blood flow
B．female sex hormone can be beneficial to blood vessels
C．female heart function hardly drops when oestrogen levels fall greatly
D．female heart function improves though not obviously
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单项选择题
The power of the female heart remains undiminished between the ages of 18 and 70 probably because _________.
A．women almost lose no contractile muscle cells in the walls of their hearts
B．women's oestrogen has a protective effect on their heart
C．the size of their heart chambers is different from men's
D．the thickness of the female heart's muscular wall is different from men's
单项选择题
What Dr. Goldspink says to men is that _________.
A．men can't recover lost heart function in any way
B．men can recover lost heart function at any age
C．proper exercise does good to the heart at any age
D．it's too late to start exercise when men are getting old
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