48. It has been estimated(估计) that the earth's surface temperature has increased _____ sone quarter to three quarters of a degree since 1850.

A. to　　 B. by　　　 C. at　　 D. with

47. The world's greatest sporting event, the Olympic Games, upholds the amateur that _____ matters is not winning but participating.

A. anything　　 B. it　　　 C. what　　 D. everything

46. Rebecca______ me earlier if she did not like her house she bought last month.

A. told　　 B. would tell　　 C. had told　 D. would have told

45. _____ the claim about German economic might, it is somewhat surprising how relatively small the German economy actually is.

A. To give　 　B. Given　　 C. Giving　　　 D. Having given

44. _____ your opinions are worth considering, the committee finds it unwise to place too much importance on them.

A. As　　 B. Since　　 C. Provided　　 D. While

43. This book will show the readers ___ can be used in other contexts.

A. how that they have observed　　　 B. that how they have observed　

C. how what they have observed　　　 D. that they have observed

42. Why this otherwise excellent newspaper allows such an article to be printed is ___ me.

A. above　　 B. outside　　 C. beside　　 D. beyond

41. One of the requirements for a fire is that the material ____ to its burning temperature.

A. is heated　　 B. will be heated　　 C. be heated　　 D. would be heated

40. So involved with their computers _____ that leaders at summer computer camps often have to force them to break for sports and games.

A. became the children　　 B. become the children　

C. had the children become　 D. do the children become

39. According to one belief, if truth is to be known it will make itself apparent, so one ____ wait instead of searching for it.

A. would rather　　 B. had to　 C. cannot but　　 D. had best