精选优质文档-倾情为你奉上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. 感染;订约;收缩vt. 感染;订约;使缩短n.
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