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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