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1.The research requires more money than__1__. A. have been put in B.has been put in C.being put in D. to be put in 2.Overpopulation poses a terrible threat to the human race. Yet it is probably__2__a threat to the human race than environmental destruction. A.no more B. not more C. even more D. much more 3.It is not uncommon for there__3__problems of communication between the old and the young. A.being B.would be C.be D. to be 4.__4__at in his way, the situation doesnt seem so desperate. A. Looking B.Looked C.Being looked D. To look 5.It is absolutely essential that William__5__his study in spite of learning difficulties. A.will continue B.continued C.continue D. continues 答案: 1.B :看新编语法教程,里面说这里than后面是省略了it,还原应该是..than it has been put in 2.B :上句说人口多对人类发展造成威胁.而大家要注意这个yet,yet常用于否定句和疑问句, 也就是说下句应该是一个否定上句的句子.,而not more ...than的意思就是 与其说是A ,不如说是B. 这句话.Yet it is probably not more a threat to the human race than environmental destruction.就是与其说是威胁了人类发展,还不如说是威胁了环境... | 
