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【单选题】
关于羊水栓塞的常见病因，下列叙述错误的是A.
胎膜早破
B.
子宫颈裂伤
C.
前置胎盘
D.
胎盘早剥
E.
子宫收缩乏力
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反馈参考答案：
举一反三
【单选题】_____ foreign friends come to visit China every year. [ ]
A.
Many thousand
B.
Thousands of
C.
Many thousand of
D.
Many thousands
【单选题】Every year, millions of people visit the Palace Museum, and many of ____ are foreigners. [ ]
A.
them
B.
that
C.
whom
D.
what
【单选题】Every year, _____ fishes are killed by the polluted water and many people are made sick by the polluted air. [ ]
A.
thousand of
B.
thousands of
C.
two thousands
D.
two thousands of
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