刺激导致兴奋，必须使跨膜电位达到
A．负后电位B．阈电位C．锋电位D．正后电位
参考答案：B
36. I felt quite ______ when I made my first speech in front of so many people.
A．unpleasant
B．stressed
C．deserted
D．Panicking
使用“剪切”命令和按Delete键删除的文本都将进入剪贴板。
A．正确
B．错误
