题目:
—What time do you usually get up?
—____________. [ ]
A. I usually get up in the morning.
B. I usually get up six forty.
C. I usually get up at six o'clock.
D. I usually get up at six forty o'clock.
答案:
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对试题解析管道是适宜于运输液体和气体等物资的一种现代化运输方式.它的优点是运量大、运价低、损耗少、安全可靠、连续性强、管理方便等.但也有设备投资大、灵活性差等缺点.生活中,自来水和天然气都是通过管...