问题
单项选择题
正常月经周期中雌激素分泌出现第二次高峰的直接原因是（）
A.卵泡刺激素（FSH）的作用
B.黄体生成素（LH）的作用
C.雌激素的正反馈作用
D.孕激素的正反馈作用
E.催乳素的作用
答案
参考答案：B
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正常月经周期中雌激素分泌出现第二次高峰的直接原因是（）
A.卵泡刺激素（FSH）的作用
B.黄体生成素（LH）的作用
C.雌激素的正反馈作用
D.孕激素的正反馈作用
E.催乳素的作用
参考答案：B
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