53. The laboratory assistant recorded the ____ reactions(反应).

　　 A. mouses’　　　　 B. mice　　　　　　 C. mices’　　　　　　　 D. mice’s

52. They are ____.　　　　　

A. mathematics student　　　　　 　　　　 B. mathematic students

C. students in mathematics　　　 　　　　 D. mathematics students

51. ____ is needed in cold countries.

　　 A. A lot of clothes　　 　　　　　　 B. Much clothing　

C. Many a cloth　　 　　　　　　　　 D. Lots of clothes

50. There are two ____ in our class.　　　　

A. Liu　　　 B. Lius　　 C. Liu’s　　　 D. Lius’

49. I’ll have to buy ____ trousers.　　　　　　

A. a　　　　 B. two　 C. a pair of　 D. a couple of

48. ____ are made of ____.

　　 A. A glass, a glass　　 　　　　　　 B. Glasses, glass　

C. The glass, the glass 　　　　　　 D. Glasses, glasses

47. We are ____ and they are ____.　　　　　　　　　 A. Englishmen, Germans　　　

B. Englishmen, German　　　 C. Englishmans, Germans　　 D. Englishmen, Germen

46. Father went to his doctor for ____ about his heart trouble.

　　 A. an advice　　　　　　 B. advice　　　 C. advices　　　 D. the advices

45. I saw many ____ seated in the corner reading something.

　　 A. Japanese　　　　 B. Japaneses　　　　 C. of Japanese　　　 D. of Japaneses

44. How happy they are! Obviously, they are ____.

　　 A. in nice spirits　 B. in nice spiritC. in high spirits　　 D. in high spirit