专四词汇练习单选题2000（含生词批注）(共91页).doc

精选优质文档-倾情为你奉上选择题训练2000题1. The atmosphere _of certain gases mixed together in definite proportions.a. composes b. comprises c. consists d. constitutes 2.While he was in the office he _doing something to doing nothing.a. preferred b. liked c. favored d. approved3.Metals_ when cooled and expand when heated.a. decrease b. reduce c. condensecondense kndensvi. 浓缩；凝结vt. 使浓缩；使压缩 d. contractcontract kntrkt, kntrktvi.