17.My parents were talking about their school days as if they ______ back at school.( )
A. | are | B. | were | C. | have been | D. | had been |
12.Meanwhile,you have to prepare the next question depending on what the person say.( )
A. | 期间;同时 | B. | 每当 | C. | 当…时候 | D. | 随着 |
10.There is a system where the waste is disposed of using the principles of ecology.( )
A. | 生态学 | B. | 生物学 | C. | 物理学 | D. | 化学 |
9.I lost sight of Wang Ping when we reached what looked like a large market because of too many carriages flying by in all directions.( )
A. | 观察 | B. | 看见 | C. | 失明 | D. | 看不见 |
8.No more typists are working on a typewriter or computer.( )
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A. | 打字员 | B. | 打字机 | C. | 作者 | D. | 信 |