基础大放脚是指基础下部逐级放大的台阶部分。( )
参考答案：对
神经冲动到达运动神经末梢时，可引起接头前膜的（）
A.Na+通道关闭
B.Ca2+通道开放
C.K+通道开放
D.Cl-通道开放
E.Cl-通道关闭
— Why didn't Jason give you one of his paintings?
— I didn't want one, but he would have given me one if I ______. [ ]
A. do
B. had
C. will
D. would
