When the wheel on the left begins to turn clockwise:

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问题 When the wheel on the left begins to turn clockwise:

选项 A、the ball will roll to the left.
B、the ball will roll to the right.
C、the tray will stay level and go up.
D、the tray will stay level and go down.

答案B

解析

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C类竞赛（非英语专业本科）

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