单项选择题

下图是反射弧的局部结构示意图，刺激c点，检测各位点电位变化。下列说法错误的是（）。

A．若检测到b、d点有电位变化，说明兴奋在同一神经元上是双向传导的
B．兴奋由c传导到e时，发生电信号—化学信号—电信号的转换
C．a处检测不到电位变化，是由于突触前膜释放的是抑制性递质
D．电表①不偏转，电表②偏转

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B: () I’m going to ask you a few questions. Then we are going to have a short conversation in English. Do you understand

A．You must have wronged me.
B．Oh! I’m so sorry about this.
C．Please stop just a second.
D．Are you Mr. Smith
E．But may I ask you something first
F．Is there anything I can do for you
G．Now, sit down please.

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A:Excuse me. Could you give me a hand B:() A:I want to move this desk out of the office.

A．Sure. What is it
B．It’s very nice of you to say so.
C．It’s nothing.
D．Have a nice trip!
E．Certainly, Here you are.