下列属于神经递质的是（）
A.脑啡肽
B.γ-氨基丁酸
C.去甲肾上腺素
D.神经降压素
E.乙酰胆碱
参考答案：A, B, C, D, E
--Peter shut his mouth at the meeting all the time. How about Tom?
______________.
A．He does so
B．He did so
C．So does he
D．So did he
如何理解心主神志？
