题目

试判断3×107mg所表示的质量可能是 A．一朵玫瑰花          B．一头小猪             C．一头大象            D．一杯水 答案：BYesterday morning he got up earlier than________ , for it was not a（n）________day.A．common; usualB．usual; ordinaryC．usual; normalD．common; ordinary