A. attribute B.distribute C.contribute D.drift (来源：http://www.EnglishCN.com)

44.White teeth are a sharp _______ to black skin.

A. content B.contract C.contrast D.contain

45.Tom is _______ about photography. He spends nearly all his money on it.

A. justice B.innocent C.fierce D.crazy

46.We need help from the other countries. But we do not _______ on others for support.

A. engage B.lean C.strip D.multiply

47.We will _______ the plan because of the cost.

A. council B.journal C.damp D.oppose

48.Our train is _______ at Shanghai at seven o’clock this evening.

A. due B.crystal C.cushion D.cooperation

49.Her voice was _______ in the noise.

A. filled B.entertained C.enormous D.drowned

50.He is very _______ in his family and never does anything against his wife.

A. hence B.possess C.outer D.humble

答案：
1.A 2.C 3.D 4.C 5.A 6.D 7.D 8.D 9.C 10.D 11.A 12.C 13.C 14.A 15.A 16.D 17.A 18.D 19.C 20.C 21.D 22.D 23.D 24.B 25.D 26.D 27.D 28.B 29.A 30.D 31.C 32.A 33.C 34.A 35.D 36.D 37.C 38.C 39.A 40.C 41.D 42.D 43.C 44.C 45.D 46.B 47.D 48.A 49.D 50.D