皮皮学，免费搜题
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【单选题】
一个胚囊母细胞经过减数分裂形成( )个卵细胞。A.
4
B.
3
C.
2
D.
1
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【简答题】生 物膜有哪些功能?
【单选题】听力原文： The human nose has given to the languages of the world many interest-ing expressions. Of course, this is not surprising. Without the nose, we could not breathe nor smell. It is a part of the fac...
A.
The human nose as an organ for breathing and smelling.
B.
The nose providing us with various expressions.
C.
A woman poet's wish to have two noses.
D.
Interesting comments made on Cleopatra's nose.