49. John was dismissed last week because of his __________ attitude towards his job. (2007年高考上海卷)

　 A. careful　 　　 B. casual　　　 　　C. classical 　　　　　　D. classic　

48. Although the _________ scientist has made his mark in the field of physics, he is sometimes absent-minded in his daily life.

　 A. brilliant　　　　 B. casual　　　　 C. bureaucratic　　　　 D. civil

47. You will not know whether it is __________ or sweet if you don’t taste it yourself.

　 A. boring　　　 B. cheerful　　　 C. changeable　　　　 D. bitter

46. This new model of car is so expensive that it is _______ the reach of those with average income. (2006年高考江苏卷)

　 A. over　　 　　 B. within　　　 　　　　 C. beyond　　　 　　　　 D. below

45. Some students often listen to music ________ classes to refresh themselves. (2007年高考四川卷)

A．between　　 　B．among　　 　　C．behind　　 　　D．during

44. Cycling is highly _________ to people’s health and the environment.

　 　A. bitter　　　 B. beneficial　　　 C. basic　　　　　 D. botanical

43. In some countries, some people do not even have fresh water or ________ health care.

　 A. basic　　　 B. botanical　　　 C. brief　　　　　　 D. bureaucratic

42. The hills in my hometown which used to be covered with green trees are now mostly __________.

A．empty 　　 B．blank　　　 　　 C．vacant　 　　　　D．bare

41. It is said that dogs will keep you _________ for as long as you want when you are feeling lonely. (2006年高考江西卷)

　 A. colleague　　　 　D. friend　 　　　　　C. companion　　 　　B. company

40. By signing the lease (租约) we made a ________ to pay a rent of $150 a week.

A. comment　　　　　 B. commitment　　　　　　 C. conception　 　　 D. consensus