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【简答题】
刺激引起兴奋的基本条件是使跨膜电位达到（）| 可兴奋细胞受刺激后，首先可出现（）| 神经细胞动作电位的主要组成是（）| 神经细胞动作电位的复极相，K + 外流至膜外，又暂时阻碍K + 进一步外流，结果形成（） A. 锋电位 B. 阈电位 C. 负后电位 D. 局部电位 E. 正后电位
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举一反三
【单选题】Look out! Don’t get close to the house, ______ the roof is under repair．
A.
whose
B.
which
C.
of which
D.
that
【单选题】.Look out! Don’t get too close to the house ______ the roof is under repair.
A.
whose
B.
which
C.
of which
D.
what
【单选题】-Tim.Don't ________ the fire, or you will get burnt. -All right. [ ]
A.
look forward to
B.
pay attention to
C.
get close to
D.
turn your back to
【单选题】—Why do you look so tired? —I ________ a day off since last month. [ ]
A.
didn't put
B.
didn't get
C.
haven't had
D.
hadn't taken
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