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【单选题】
启动内源性凝血途径的物质是A.
Ⅲ 因子
B.
Ⅶ 因子
C.
Ⅷ 因子
D.
Ⅺ 因子
E.
Ⅻ 因子
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反馈参考答案：
举一反三
【判断题】Sounds are said to be in contrastive distribution if they appear in the same environment.()
A.
正确
B.
错误
【单选题】在下列何种情况下，可认为火势已被控制住：
A.
灭火剂正在火床上施放，并己开始有效地把火冷却
B.
火的主体已经暗下去
C.
所有火势可能扩散的路线都已加以检查或保护
D.
以上都对
【单选题】听力原文：A: About big international issues: what do you see as the most important environmental issues of the moment? B: It’s quite difficult to make a kind of hierarchy of worry here, because so many iss...
A.
air pollution
B.
water pollution
C.
rain forests
【单选题】According to the passage, some slumdwellers are not interested in improving their environments because they ______.
A.
are unsure of their residency
B.
dislike urbanization
C.
are used to the president environment
D.
are homogeneous and anonymous
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