第9题: [单项选择]Pollutants introduced into a lake can rapidly accelerate its natural aging process. A. change B. speed up C. turn around D. destroy 参考答案:B 答案解析: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