46. When he arrived， he found _C_ the aged and the sick at home.

　　A nothing but B none other C none but D no other than

　　形容词前加the表示一类人。 none but 只有，仅有。

　　47. The pressure _B_ causes Americans to be energetic， but it also puts them under a constant emotional strain.

　　A competing B to compete C to be competed D having competed

　　the right to vote 选举权。 动词不定式作后置定语要用主动形式。

　　the pressure to compete 竞争的压力。

　　49. As teachers we should concern ourselves with what is said， not what we think _C_.

　　A have to be said B must say C ought to be said D need to say

　　50. Once environmental damage _A_， it takes many years for the system to recover.

　　A is done B is to do C does D has done

　　51. Studies show that the things that contribute most to a sense of happiness cannot be bought， _B_ a good family life， friendship and work satisfaction.

　　A as for B such as C in case of D in view of

　　contribute to 对…做出贡献。

　　52. He will agree to do what you require _D_ him.

　　A for B from C to D of

　　require sth. of sb. 要求某人做某事。

　　53. The mere fact _A_ most people believe nuclear war would be madness does not mean that it will not occur.

　　A that B which C what D why

　　fact后面要加同位语从句。

　　54. John seems nice person. _C_， I don’t trust him.

　　A Even though B Therefore C Even so D Though

　　even so 即便如此，尽管如此。

　　55. I don’t think it advisable that Tom _A_ to the job since he has no experience.

　　A be assigned B will be assigned C is assigned D has been assigned

　　advisable后面加句子要用虚拟语气，形式为：(should)+ 动词原形。

　　56. _D_， a man who expresses himself effectively is sure to succeed more rapidly than a man whose command of language is poor.

　　A Other things to be equal B Were other things equal

　　C To be equal to other things D Other things being equal

　　B项如果不省略if应为：If other things were equal

　　如果从句用虚拟语气，主句也必须用虚拟语气形式。

　　other things being equal 在这里是独立主格做条件状语。