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【单选题】
函数 在区间[0，2]上的最大值比最小值大 ，则 的值为（ ）A.
B.
C.
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【单选题】The impact of Thoreau's' On the Duty of Civil Disobedience' might not have been so far- reaching _______ , for Elizabeth Peabody, who dared to publish the controversial essay.
A.
it not having been
B.
it is not being
C.
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D.
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A.
aquatic ecosystems
B.
birds
C.
bats
D.
polar bears
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