细胞膜内外存在的电位差通称为
A．锋电位B．阈电位C．负后电位D．局部电位E．正后电位
参考答案：C
Do you expect _____ to be a possibility that we may have five days off for the coming Dragon Boat Festival?
A．it
B．there
C．as
D．this
美丽：漂亮
A．痛苦：厌恶
B．反对：反感
C．鼓励：打击
D．高兴：快乐
