肝脏内合成乙酰乙酸的直接前体物质是

A．β-羟丁酸

B．β-羟丁酰辅酶A

C．乙酰乙酰辅酶A

D．HMG-CoA

As part of the communications process，the receiver is responsible for______.

A．agreeing with the sender's message

B．pretending that the message is received only partiallto encourage further discussions

C．making sure that the information is received in its entirety and understood correctly

D．specifying that the message is not understoounless it is reduced to writing