第10题: [单项选择]The substance can be added to gasoline to {{U}}accelerate{{/U}} the speed of automobiles. A. quicken B. shorten C. loosen D. enlarge 参考答案:A 答案解析:[解析] accelerate,v.“加速,促进”,所以A“加快”是答案。shorten,v.缩短,(使)变短; loosen,v.解开,放松,松开;enlarge,v.扩大,放大;词缀-en通常加在