题目

— How long have you ________？— For two weeks.        A. borrowed the library book            B. bought your new car        C. been back from abroad                  D. come back from school 答案：C小强从学校到少年宫每小时走4.5千米，0.6小时到达．如果每小时少走1.5千米，需多少小时到达？