问题
单项选择题
乳汁开始泌乳的支持系统是
A．低孕激素高雌激素水平
B．低雌激素高生乳素水平
C．低雌激素高泌乳素水平
D．低孕激素高泌乳素水平
E．低孕激素低雌激素水平
答案
参考答案：C
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乳汁开始泌乳的支持系统是
A．低孕激素高雌激素水平
B．低雌激素高生乳素水平
C．低雌激素高泌乳素水平
D．低孕激素高泌乳素水平
E．低孕激素低雌激素水平
参考答案：C
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| Today is 1 first day for Mary 2 to school. So she is very 3 . She gets up very early and quickly has her breakfast and then 4 to school. But when she comes back from school, her mother, Mrs. Smith 5 that she is unhappy. So Mrs. Smith asks her. "What's the matter with you, my dear?" Mary says 6 a low voice. There are many 7 in our school. I can't stand them."Mrs. Smith says 8 a smile (微笑), "In fact, there are 9 many rules in our daily life, but you didn't pay attention to (注意) them. Why? That is because you have got used to (习惯) them. So you will follow them all 10 yourself. You will find they are a part of your life. " | |||
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