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【单选题】
避孕药中孕激素的主要作用是(    )
A.
抑制孕卵着床    
B.
影响子宫收缩
C.
抑制LH释放而抑制排卵    
D.
反馈抑制FSH分泌而抑制排卵
E.
影响胎盘功能
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D.
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