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题目材料：
People who have low bone density have a markedly higher-than- average incidence of stroke, as do people with high blood pressure. There are well-known mechanisms by which high blood pressure can cause a stroke, but since it is highly unlikely that there are any mechanisms by which low bone density can cause a stroke, or vice versa, a possible hypothesis to account for the association between low bone density and stroke is that ____________.
Which of the following most logically completes the argument?
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Aa higher proportion of people with high blood pressure than of people with low bone density have strokes
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Bwhatever causes low bone density in people protects them from high blood pressure
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Cthere is a condition that can cause both low bone density and strokes
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Dthose people with high blood pressure who take steps to lower it in order to prevent a stroke generally take no steps to increase their bone density
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Ethere are few initial symptoms of high blood pressure or of low bone density
C显示答案
