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【单选题】
According to the passage, Redelmeier and Singhs studyA.
has been refined further by the two doctors.
B.
has disproved the conclusions of the two doctors.
C.
considered both positive and negative factors.
D.
considered the positive effects of several factors.
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反馈参考答案：
举一反三
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/; a
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the; the
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【单选题】Some people argue using _______ nature to meet our own needs may spell disaster, unless we start to look around and understand how _________ clean environment benefits us all.
A.
the; a
B.
the; the
C.
/; a
D.
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