单选题
Why is heart disease the most dangerous killer in the United States?
A、
Because American people drink too much spirits.
B、
Because there are a great number of fat people there.
C、
The author doesn't give a definite answer.
D、
Because American people eat too much fatty fish.
【正确答案】
C
【答案解析】
[解析] A、B、D选项文中未提及。对于在美国为什么心脏疾病是头号杀手的问题作者并没有给出明确答复。
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