The engine is ______ at 6,000 revolutions per minute.

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问题 The engine is ______ at 6,000 revolutions per minute.

选项 A、turning in
B、turning off
C、turning over
D、turning to

答案C

解析 turn over“(机器等)转动”,“翻动”;turn in“交还”;turn off“关上(水源、电灯、煤气、收音机、电视机等)”,是turn on的反义词组;turn to“转向”。本题意为:“这引擎正以每分钟6,000转的速度运转。”因此,C是正确答案。
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