Let’s _______ them _______ our home town.

A．show, visit

B．show, around

C．to show, to visit

D．to show; around

目前普遍认为，中枢神经递质大体可分哪几类()

A．传统神经递质

B．肾上腺皮质激素类递质

C．氨基酸类递质

D．阿片类递质

E．神经肽类递质