48.I'd rather you ________ make any comment on the issue for the time being. A) don't B) wouldn't C) didn't D) shouldn't 正确答案： C

49.The 20th century will not be remembered as the era when space was conquered, or the power of the atom harnessed, but ________ in which the first machines having intelligence were made.

A) that B) one C) some D) this 正确答案： A 50.His ill-health may well be ________ malnutrition.

A) due to B) next to C) thanks to D) up to 正确答案： A 51.All ________ is needed is a supply of oil.

A) the thing B) that C) what D) which 正确答案： B

52.The old overseas Chinese looked in _____ at his hometown, which changed so greatly that he could hardly recognize it.

A) strange B) confusion C) difficulty D) unfamiliarity 正确答案： B 53.Modern science is critically ___________ high-performance computing.

A) characterized by B) dependent on C) active in D) strict with 正确答案： B

54.It seems oil ________ from this pipe for some time. We’ll have to take the machine apart to put it right.

A) had leaked B) is leaking C) leaked D) has been leaking 正确答案： D 55.This enables the cells to _____ so that you grow taller, broader and stronger. A) multiple B) mount C) murder D) multiply 正确答案： D 56.Everybody liked the stranger, but _____ he was a criminal.

A) of a truth B) in a matter of fact C) in reality D) in the fact 正确答案： C 57.The waitress did bring us clean plates eventually, but with a very bad _____. A) mood B) joy C) grace D) emotion 正确答案： C

58.The sun appears to go round the Earth, but that is only a(n) ___________. A) occasion B) recession C) inspection D) illusion 正确答案： D 59.An animal's _____ causes him to run from danger.

A) reaction B) instinct C) sense D) intention 正确答案： B 60.The whole nation ___________ the death of a much-loved premier.

A) complemented B) drained C) mingled D) mourned 正确答案： D