填空题
No direct relationship has been proven between high cholesterol levels and heart attacks.
【参考答案】
N
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Boys have a higher risk of developing heart disease than girls.
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住房问题在大城市变得越来越严重2．住房问题的产生原因和给城市带来的影响3．建议一个解决办法 How to Solve the Housing Problem in Big Cities
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