消化腺上的迷走神经M受体阻断剂是
A．阿托品B．筒箭毒C．心得安D．酚妥拉明E．多巴胺
参考答案：A
---What does your mother do to keep fit, Tom? ---She usually ______ after supper.
A．walk
B．walks
C．is walking
D．to walk
“方法”和“方法论”
