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【单选题】
下列哪个不是危险因素的作用特点（）A.
潜伏期长
B.
联合作用
C.
广泛存在
D.
与慢性病是单果关系
E.
特异性弱
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反馈参考答案：
举一反三
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【单选题】I told him a couple of rumors that I’d heard and his response was ____________ with laughter and later ____________ other friends.
A.
roaring; tell
B.
roar; to tell
C.
roared; told
D.
to roar; tell
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