下列关于正常人体内发生的生理活动的叙述，错误的是 [ ]

A．抗体或者淋巴因子与抗原特异性结合后通常被吞噬细胞吞噬、分解

B．动物激素被靶细胞接受并起作用后就被灭活

C．神经递质作用于突触后膜上的受体后被迅速分解

D．唾液淀粉酶随食物进入胃腔后不能继续发挥催化作用

SDLC was invented by IBM to replace the older Bisynchronous protocol for wide area connections between IBM equipment. A varietion of the (71) protocol called NRM is essentially the same as SDLC. SDLC is (72) protocol like HDLC, Frame Relay or X.25.An SDLC network is made up of (73) that controls all communications, and (74) . It is capable of (75) operation, but almost all practical applications are strictly half duplex.

A．HDLC

B．Frame Relay

C．X.25

D．X.21