单项选择题
胎盘的最内层是( )
A.包蜕膜
B.羊膜
C.叶状绒毛膜
D.底蜕膜
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单项选择题
After admitting she still loves him,she ()asks him to leave.
A.nonetheless
B.anyway
C.however
D.though
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单项选择题
下列属于婴幼儿锌缺乏的症状是()
A.贫血
B.干眼症
C.癞皮病
D.生长发育缓慢
E.婴儿脚气病
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