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【单选题】
抑制性突触后电位产生时，突触后膜局部电位的变化是A.
极化
B.
去极化
C.
超极化
D.
复极化
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反馈参考答案：
举一反三
【单选题】I don‘t know when she ___ back, but give her the message if she comes in before two.
A.
is
B.
will be
C.
has been
D.
was
【单选题】—When did you go to the Palace Museum? —____________. [ ]
A.
Two days before
B.
Two days ago
C.
For two days
【判断题】When wecompare two things, we show how they are different; when we contrast two things, we show how they are similar.
A.
正确
B.
错误
【简答题】It was two days later __________ they began to discuss my suggestion. A) when B) that C) what D) on which
【单选题】None of us called the police when the two cars collided, ____?
A.
didn’t we
B.
don’t we
C.
did we
D.
do we
【单选题】When doves are about two weeks old, they are covered with grey feathers and are ready to try their wings.
A.
grow
B.
wrap
C.
hide
D.
test
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