词汇练习Directions: In this part there are 100 incomplete sentences. Under each incomplete sentence there are four choices marked a, b, c and d. Choose the ONE answer that best completes the sentence.1. The atmosphere of certain gases mixed together in definite proportions.a. composesb. comprisesc. consistsd. constitutes2. While he was in the office he doing something to doing nothing.a. preferredb. likedc. favouredd. approved3. Metals when cooled and ex
