第18题: [单项选择]A man who goes from door to door selling things has to be ________ if he wants to succeed. A. abundant B. aggressive C. ambitious D. arbitrary 参考答案:B 答案解析:沿门兜售货物的人要想成功,必须要有闯劲。abundant意为“丰富的,充足的”;aggressive“侵略性的,攻击性的;有进取心的”;ambitious“野心勃勃的;有抱负的”;arbitrary“