4. Passage 20 Clifford Stoll ran a computer system in Berkelely， California. As a system administrator， he kept a close eye on the records. One day， Stoll found something strange in the payment record. There was a 75 cents mistake. One of the thousands of users had used the system for 75 worth of time and not paid for it. It might sound like very little money to worry about. But that 75 cents was the first clue Stoll had to a much bigger problem — that a hacker(黑客)had broken into Stoll‘s computer system. Who was it? Stoll spent the next year trying to find out. During that time the hacker used the system in Berkelely as a starting point to break into military computer systems all over the United States. Stoll had to keep track of the hacker‘s activities on the computer without the hacker‘s knowing someone was watching him. Stoll even made up huge files of false information so the hacker would have lots to read. When the hacker spent long time reading， the telephone company was able to trace the lines. After a year， the hacker was traced back to his computer — in Germany. He was later caught by the German police. What did Stoll decide to do when he found the problem?

159.It was a very( )meeting; we made a lot of important policies.

A. 　fruit

B. 　 fruitless

C. 　 fruitful

D. 　 fruitiness

3.Travelers in space have to( )many discomforts in their rockets.

A. 　persist

B. 　 care

C. 　 endure

D. 　 allow

80.I think the scientist isthe high praise that has been given to him.

A. 　worth

B. 　 worthy of

C. 　 worthwhile

D. 　 valuable to

45.During our stay in Europe we visited many places of( )spots， including several castles.

A. 　historic

B. 　 history

C. 　 histrionic

D. 　 historical

97.Though very busy with his work， he does mountain climbing once( )a while with his friends.

A. 　for

B. 　 at

C. 　 as

D. 　 in

85.If you have difficulty( )a particular book， please ask one of the librarians for assistance.

A. 　to find

B. 　 find

C. 　 finding

D. 　 found

116.It( )that the mysterious visitor was an old friend of my grandmother.

A. 　turned up

B. 　 turned off

C. 　 turned on

D. 　 turned out

5. Passage 6 Community service is an important component of education here at our university. We encourage all students to volunteer for at least one community activity before they graduate. A new community program called ―One On One‖ helps elementary students who‘ve fallen behind. Your education majors might be especially interested in it because it offers the opportunity to do some teaching， that is， tutoring in Math and English. You‘d have to volunteer two hours a week for one semester. You can choose help a child with Math， English， or both. Half-hour lesson are fine， so you could do a half hour of each subject two days a week. Professor Dodge will act as a mentor to the tutors ---- he‘ll be available to help you with lesson plans or to offer suggestions for activities. He has office hours every Tuesday and Thursday afternoon. You can sign up for the program with him and begin the tutoring next week. I‘m sure you will enjoy this community service and you‘ll gain valuable experience at the same time. It looks good on your resume， too， showing that you‘ve had experience with children and that you care about your community. If you‘d like to sign up， or if you have any questions， stop by Professor Dodge‘s office this week. Whom do you think the passage dresses to?

A. 　Faculty.

B. 　 Students.

C. 　 Freshman.

D. 　 Graduating students of the university.

96.We dashed to the bus station and barely got on the bus when it( ).

A. 　pull over

B. 　 pulled away

C. 　 pull through

D. 　 pull out

166.Pigeon is often considered a【n】( )of peace.

A. 　example

B. 　 sign

C. 　 mark

D. 　 symbol