专业英语八级考试改错练习模拟试题
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task 1
The telephone system is a circuit-switched network. For much of the history of the system, when you placed 26
a call, you were renting a pair of copper wires that ran continuously from your telephone to the other party’s phone. You had excluding use of those wires during the 27
call; when you hung up, they were rented to someone else. Today the transaction is more complicated. your call may well possess a fiber-optic cable or a satellite with hundreds of other calls, but more conceptually the system 28
still works the same way. When you dial the phone, you get a private connection of one other party. This is an alternative network architecture called 29
packet switching, in which all stations are always connected to the network, but they receive only the messages addressed to them. It is as if your telephone was always tuned in to 30
thousands of conversations going on the wire, but you 31
heard only the occasional word intended to you. Most 32
computer networks employ packet switching, because it is more efficient than circuit switching when traffic is heavy. It seems reasonable the existing packet-switched 33
network will grow, and new one may be created; they could 34
well absorb traffic that would otherwise go to the telephone system and thereby reduce the need for telephone numbers. 35
答案:
26.much改为most
27.excluding改为exclusive?
28.more?
29.This改为There
30.was改为were?
31.going后加by
32.to改为for
33.reasonable后加that
34.one改为ones
35.need改为demand??