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【单选题】
月经的发生与下列哪种因素有关A.
血液中前列腺素的浓度降低
B.
血液中孕酮和雌二醇水平下降
C.
血液中孕酮水平升高、雌二醇水平下降
D.
卵泡刺激素和生成素水平升高
E.
血中人绒毛膜促性腺激素浓度升高
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举一反三
【单选题】—Thank you for your help. —______ [ ]
A.
I am OK .
B.
You are welcome .
C.
Yes,you are right .
D.
Thanks .
【单选题】Don't just wait for other's help. God help those who help . [ ]
A.
him
B.
you
C.
them
D.
themselves
【单选题】—Thank you your great help. —You are .
A.
for;welcome
B.
to;right
C.
of;great
D.
of;right
【单选题】— Where is your sister, Dick? I need her help. — Dad, she in her room. Let me help you instead.
A.
sleeps
B.
is sleeping
C.
slept
D.
was sleeping
【单选题】Thank you very much for giving me so much help. --- (_______) .
A.
No thank you
B.
You’re welcome
C.
OK
D.
Thanks
【单选题】It was stupid ____ him for help. Everyone knows that he is very mean.
A.
you ask
B.
for you to ask
C.
of you to ask
D.
of you asking
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