If you run ____ two hares you will catch neither.
A.into
B.after
C.off
D.out of
答案:B
Packet-switching wireless networks are preferable (41) when transmissions are (42) because of the way charges are (43) per packet. Circuit-switched networks are preferable for transferring large files or for other lengthy transmissions because customers are (44) for the (45) of time they use the net-work.
A.long
B.short
C.large
D.small