来源：文都四级系列图书 作者：郭崇兴
6
大学英语四级考试全真预测试卷
Model Test Six
Part IWriting（30 minutes）
Directions:For this part, you are allowed 30 minutes to write a letter to your American friend Lawrence, to introduce Spring Festival in China and invite him to join you to spend this Spring Festival. Suppose you are Zhang Lin. You should write at least 120 words following the suggestions given below in Chinese:
1. 表达你对Lawrence的想念之情。
2. 介绍中国的春节。
3. 邀请Lawrence和你们一起过春节。
A Letter to Lawrence
September 23, 2007
Dear Lawrence,
Yours,
Zhang Lin
Part IIReading Comprehension (Skimming and Scanning)
(15 minutes)
Directions: In this part, you will have 15 minutes to go over the passage quickly and answer the question on Answer Sheet 1.
For questions 1-7, mark
Y (for YES)if the statement agrees with the information given in the passage;
N (for NO)if the statement contradicts the information given in the passage;
NG (for NOT GIVEN)if the information is not given in the passage.
For questions 8-10, complete the sentences with the information given in the passage.
Computer Crime
A computer crime is generally defined as one that involves the use of computers and software for illegal purposes. This doesn’t mean that all the crimes are new types of crime. On the contrary, many of these crimes, such as embezzlement of funds, the alteration of records, theft, vandalism, sabotage, and terrorism, can be committed without a computer. But with a computer, these offenses can be carried out more quickly and with less chance that the person responsible for the crime will be discovered.
Computer crimes are on the rise and have been for the last twelve years. Just how much these computer crimes cost the American public is in dispute, but estimates range from ＄3 billion to ＄5 billion annually. Even the FBI, which attempts to keep track of the growth or decline of all kinds of crimes, is unable to say precisely how large a loss is involved; however, it estimates that the average take from a company hit by computer crime is ＄600,000. A number of reasons are given for the increase in computer crime: （A） more computers in use and, thus, more people who are familiar with basic computer operation; （B） more computers tied together in satellite and other data transmission networks; and （C） the easy access of microcomputers to huge mainframe data bases.
The Criminal
Movies and newspaper stories might lead us to believe that most computer crimes are committed by teenage “hackers” brilliant and basically good children who let their imagination and technical genius get them into trouble. But a realistic look at the crimes reveals that the offender is likely to be an employee of the firm against which the crime has been committed, i.e., an “insider”.
Difficulty of Detection and Prevention
Given the kind of person who commits a computer crime and the environment in which the crime occurs, it is often difficult to detect who the criminal is. First of all, the crime may be so complex that months or years go by before anyone discovers it.
Second, once the crime has been revealed, it is not easy to find a clear trail of evidence that leads back to the guilty party. After all, looking for “weapons” or fingerprints does not occur as it might in the investigation of more conventional crimes.
Third, there are usually no witnesses to the computer crime, even though it may be taking place in a room filled with people. Who is to say if the person at the next terminal, calmly keying in data, is doing the company’s work or committing a criminal act?
Fourth, not enough people in management and law enforcement know enough about c
