题目内容
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[主观题]
Which of the following does the passage infer?A.We now fully understand how risk factors t
Which of the following does the passage infer?
A.We now fully understand how risk factors trigger heart attacks.
B.We recently began to study how risk factors trigger heart attacks.
C.We have not identified many risk factors associated with heart attacks.
D.We do not fully understand how risk factors trigger heart attacks.
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