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B: so a large room that C: such large room that D: such large a room that 标准解答:

(单选题)39: It is only recently _________astronomers have begun specific research into black holes. A: when B: so that C: that D: which 标准解答:

(单选题)40: _________the heavy rain, we stayed at home. A: But for B: Due to C: Owing to D: As to 标准解答:

(单选题)41: The old lady has never ____ the house since she moved in. A: been away B: left C: lived D: stayed at 标准解答:

(单选题)42: It is a ____ truth that man is the only animal that has the power to speak and reason. A: worthy B: virtual C: universal D: indefinite 标准解答:

(单选题)43: How can we finish the work in the ____ of any other helpers? A: era B: haste C: spare D: absence 标准解答: (单选题)44:

The young man made a _________ to his parents that he would try to earn his own living after graduation. A:   prediction B:   promise C:    plan D:   contribution 标准解答:

(单选题)45: When the fever eventually____, he is likely to feel tired and weak for a while. A: dies down B: dies out C: loses D: leaves 标准解答:

(单选题)46: Most of us require an environment________outside distraction. A: free of B: free from C: free away D: free without 标准解答:

(单选题)47: Our teacher was ____ by the funny story. A: naked B: yielded C: amused D: expanded 标准解答:

(单选题)48: In fact, there is no ____ liberty in any country. A: adequate B: absolute C: private D: practical 标准解答:

(单选题)49: Hardly had Professor Birch finished his speech_________the audience started cheering. A: as B: than C: when D: since

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(单选题)50: They are going downtown ____bus instead of ____their bikes. A: by,by B: on,by C: by,in D: by,on 标准解答: