艺术品拍卖的效应不包括（）
A.广告效应
B.投资效应
C.历史效应
D.文化效应
参考答案：C
Packet-switching wireless networks are preferable (1) when transmissions are (2) because of the way charges are (3) per packet. Circuit-switched networks are preferable for transferring large files or for other lengthy transmissions because customers are (4) for the (5) of time they use the network.
1（）
A．to
B．for
C．than
D．only
继承的方式有公有继承、私有继承和【 】3种。
