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【单选题】
以下关于细胞膜离子通道的叙述，正确的是A.
在静息状态下，Na+、K+通道处于关闭状态
B.
细胞接受刺激开始去极化时，就有Na+通道大量开放
C.
在动作电位去极相，K+通道也被激活，但出现较慢
D.
Na+通道关闭，出现动作电位的复极相 本题为单选题，请选出正确答案，谢谢！
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举一反三
【单选题】. ----Are you planing to hunt for a new job? ----I’m not sure. I ____ go abroad to study further instead.
A.
must
B.
might
C.
would
D.
should
【简答题】按所给定的主、俯视图,想像形体,找出相应的左视图:____。
【单选题】I met Jennifer in the street _____ and she told me she would go to study abroad next month. [ ]
A.
some day
B.
the other day
C.
one day
D.
another day
【单选题】—Mum, I hope we can spend our holiday abroad this year. —______ I’m too busy to take a trip abroad.
A.
Better forget it.
B.
Why not?
C.
It couldn’t be better
D.
Good idea!
【单选题】—Do you regret not having gone abroad? —Why should I? I ____as much, but I’m glad to devote myself to our motherland.
A.
didn’t earn
B.
don’t earn
C.
hadn’t earned
D.
haven’t earned
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