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什么叫自然坐标系?

[音频]听录音回答1-2题

An apartment with a good view.
B. An apartment of two-bedrooms.
C. An apartment on the ground floor.
D. An apartment with central heating.

2

A. Near a subway station.
B. Near a hotel.
C. In the downtown.
D. In the suburbs.

3.[音频]听录音回答3-5题

A. To have better opportunities.
B. To improve his skills.
C. To work fewer hours.
D. To get a higher salary.

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