题目内容
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[单选题]
The survival of civilization as we know it is ______ threat.
A、within
B、under
C、towards
D、upon
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题目内容
（请给出正确答案）
如果结果不匹配，请 联系老师 获取答案
题目内容
（请给出正确答案）
A、within
B、under
C、towards
D、upon
如果结果不匹配，请 联系老师 获取答案
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