单项选择题

The article is written to illustrate _________.

A．the greenhouse effect
B．the solar effects on the earth
C．the models of solar-weather interactions
D．the factors responsible for the global climate
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单项选择题
A medical explanation as to the question why women live longer than men is that _________.
A．women have to live long enough to look after grandchildren
B．women's hearts hardly grow old
C．women have more endurance than men
D．women are superior at evolutionary scale
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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