Key to Test 5:
1.C2.A3.D4.B5.D6.D7.C8.C9.D10.C11.C12.C13.D14.B15.B
16.A17.B18.C19.D20.C
18. D22.C23.B24.D25.A26.A27.B28.D29.B30.A
31.C32.B33.A34.B35.D36.A37.A38.C39.A40.D
41.D42.A43.C44.B45.B46.A47.B48.D49.D50.C
51.B52.D53.C54.C55.A56.D57.A58.B59.D60.C
61.A62.B63.C64.B65.B66.C67.C68.D69.A70.A
71.B72.D73.A74.C75.B76.B77.D78.D79.B80.A
81.C82.C83.B84.C85.C86.A87.B88.B89.D90.C
91.D92.D93.A94.B95.C96.A97.C98.D99.B100.C
范文：
Competition and Cooperation
Competition is a common phenomenon in our social life. We compete when we play games, we try to do better than others in our study, and there is constant competition for jobs, money and so forth. We can say, to some extent, competition is one of the motive forces of the development of society.
We often find competition and cooperation at the same time. Think of a football game. Each team is competing with the other team, but each member of the team is cooperating with his or her teammates. In most cases, we can’t have competition without cooperation. Thus they are equally important.
While we are advocating competition, we can not forget cooperation. Nothing is to be carried to extremes. Pure and exclusive competition leads to failures. Only competition together cooperation helps us a great deal in obtaining our goal and satisfying our needs, especially in modernizing our country.