Pollutants introduced into a lake can rapidly accelerate its natural aging process.

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问题 Pollutants introduced into a lake can rapidly accelerate its natural aging process.

选项 A、change
B、speed up
C、turn around
D、destroy

答案B

解析画线词accelerate的意思是“加快，加速”。含义与speedup同。辨义：A．change变化； B．speedup加快，力D速，词义与accelerate相同；C．turnaround旋转；D．destroy破坏。故正确答案为B。

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