下列市场结构中，（）是由一个卖者或一个买者控制的市场。
A.完全竞争市场
B.寡头垄断市场
C.完全垄断市场
D.垄断竞争市场
参考答案：C
小涛和妈妈在环形跑道上跑步，小涛跑一圈用8分钟，妈妈跑一圈用6分钟，几分钟之后妈妈和小涛在起点处第一次相遇？
指出错误并改正。
1. I fell in love with the city the first time when I visited it.
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2. No matter how the job is difficult, I'm determined to finish it on schedule.
3. Hurry up! The train is about to leave at 8 o'clock.
4. — Peter is ill in hospital.
— Really? I'm sorry to hear that. I'm going to go to see him.
5. The old car of Tom's always breaks down half way.
