题目内容：
According to some researchers，by measuring the levels of NT－proBNP in the blood people may know______
A．where fewer people die from heart proble B．whether they have the risk of heart attack，heart failure or strok
C．would probably have lower rates of heart diseas
D．how to test a person’s NT—pmBNP level in the blood by himsel
E．his heart muscle would be under pressure in some wa
F．that napping is of great benefit to women to
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答案解析：