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搜题
【单选题】
月经周期中子宫内膜呈周期性变化，血浆中促性腺素释放素（GnRH）、促卵泡激素（FSH）、促激素（LH）、雌二醇与孕酮含量呈动态变化。月经的发生是由于血中（）A.
雌激素急剧减少
B.
孕激素急剧减少
C.
雌激素和孕激素急剧减少
D.
前列腺素减少
E.
雄激素减少
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反馈参考答案：
举一反三
【单选题】The book tells small business owners that
A.
there will be many things that they couldn't manage．
B.
they could get encouragement from the book．
C.
they should achieve their respective goals in various ways．
【多选题】Accordong to the teacher, what are the principles to ensure the effectiveness of your arguments?
A.
To avoid assumptions.
B.
To ensure cohesion.
C.
To ensure coherence.
D.
To ensure objectivity.
【单选题】How many English books are there on the table?there is only —English book on it.
A.
a
B.
An
C.
One
D.
The
【单选题】What does the reviewer believe is a great book?
A.
There should be many surprising ideas in a great book.
B.
A good book doesn't necessarily mean many new views.
C.
The author of a good book should have the same idea as the reader has.
【简答题】管状组织的表里纬的投纬比应为:(__________________ )。
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