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【单选题】
细胞受刺激而兴奋时,膜内电位负值减少称为( )A.
极化
B.
去极化
C.
复极化
D.
超极化
E.
动作电位
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举一反三
【单选题】The reason ______ he gives for not coming is that his mother won’t let him.
A.
for which
B.
why
C.
which
D.
because
【简答题】John is six years old. He can read and write well. But he can’t tell the time. His mother, Mrs Brown teaches him many times, but he still can’t tell. He would say “breakfast time”, “lunchtime” and “t...
【简答题】Give Me a Big Box of Chocolates John liked chocolates very much, but his mother never gave him any, because they were bad for his teeth, she thought. But John had a very nice grandfather. The old man ...
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