农信银电子汇兑业务包括（）。
A.汇兑
B.委托收款（划回）
C.托收承付（划回）
D.退汇
参考答案：A, B, C, D
Let’s take a walk for supper, ______ ______?
A．shall we
B．will you
C．will we
D．are you
Before（）,a station shall take precautions to ensure that its emission will not interfere with transmission already in progress.
A.transmit
B.to transmitting
C.transmitting
D.in transmitting
