公共英语五级完形填空专项练习5.doc.doc

洛基英语,中国在线英语教育领导品牌
Unit 10
Part Ⅱ prehension
(35 minutes)
Directions: There are 4 passages in this part. Each passage is followed by some questions or unfinished statements. For each of them there are four choices marked A), B), C) and D). You should decide on the best choice and mark the corresponding letter on the Answer Sheet with a single line through the centre.
Passage One
Questions 21 to 25 are based on the following passage:
More and more, the operations of our businesses, governments, and financial institutions are controlled by information that exists only puter memories. Anyone clever enough to modify this information for his own purposes can reap substantial rewards. Even worse, a number of people who have done this and been caught at it have managed to get away without punishment.
It's easy puter crimes to go undetected if no one checks up on what puter is doing. But even if the crime is detected, the criminal may walk away not only unpunished but with a glowing mendation from his former employers. Of course, we have no statistics on crimes that go undetected. But it's disturbing to note how many of the crimes we do know about were detected by accident, not by systematic inspections or other security procedures. puter criminals who have been caught may be the victims of monly bad luck.
For example, a certain keypunch (键盘打孔) plained of having to sta