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专四词汇练习单选题2000（含生词批注）
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. condense d. contract
