2. I remember _______, but I have forgotten the exact number.

　 A. paying　　　　　　　　　　　　　　　　　　　　　　 B. being paid

C. to pay　　　　　　　　　　　　　　　　　　　　　　 D. to be paid

1. They _____a lot through group work on the sports field.

　 A. earned　　　　　　　　 B. gained　　　　　　　 C. won　　　　　　　　　 D. achieved

50. mistake　 51. get　 　 52. announcement 53. serious　 　 54. stand

[书面表达]

One possible version:

As time goes on, both city people and country people have a lot of free time. They have different ways to spend their weekends.

　 　After a stressful week of hard work, city people would like to go to the country and return to nature. They go fishing or traveling into the country while some go hiking into the country. Some people go to the country by car or by bike while others go on foot. They went to relax themselves, breathe fresh air and do exercise in the open air.

　 　On the other hand, country people will drive into cities for shopping. They will see films or go to concerts on weekends. Country people want to perceive modern city life in this way.

45. wait　 　 46. bought　 47. afraid　　　 　 48. seller　　 49. exactly　

44．A。本文主要是讲了随着油价的上升和对于温室气体的排放的限制，这不断激励着对于太阳能这一新技术的开发。

[对话填空]

43．C。由文章的第五段可知。

42．A。由文章第三段可知，下面所举的两个例子是为了阐述本段第一句话的观点的。

41．D。由第二段第一、二句话可知，当油气的价格升高时，物价也就上升，从而成本提高，人们就会转向太阳能等可再利用的能源。反而，就会充分利用油气能源。

40．B。文章主要是提到了油价、天然气价格提高(成本提高)和对于温室气体的排放量的限制。因此，总共是两个原因。

39．B。这是一道判断态度题。作者只是客观地介绍了北京市民的态度，并没有阐明自己的态度。

B篇主要是讲了随着油价的上升和对于温室气体的排放的限制，这不断激励着对于太阳能这一新技术的开发。