题目

—Could you please lead your car to me this Sunday?        —_________you have it cleaned after using it.        A．Although  B．So long as C．Even if     D．As soon as 答案：B能用光的直线传播知识解释的现象是（ ）A．水中倒影 B．雨后彩虹 C．形影不离 D．海市蜃楼