单项选择题

From the fourth paragraph we learn that ______.

A．heart attacks are more likely caused by alcohol than stroke
B．moderate drinking discourage blood platelets from clotting
C．boosting the levels of good cholesterol can lead to heart attacks
D．moderate drinking protect people by making the blood cell clump

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单项选择题The new study conducted by Dr. Sacco and his colleagues is unique in that ______.

A．it refutes early studies on the protective effect of moderate drinking against heart attack
B．it confirms early studies of moderate drinking against heart attacks
C．it helps to resolve the disputes over the effect of moderate drinking against stroke
D．it finds that moderate drinking can benefit people of different races equally well

单项选择题Which of the following statements is TRUE about the effect of drinking against strokes

A．Moderate drinking protects against heart attacks and strokes in different ways.
B．Even heavy drinkers suffer less chance of a stroke than non-drinkers.
C．Alcohol works only on patients who suffer clot-type strokes to protect them.
D．White people are more likely to benefit from moderate drinking than nonwhites.