题目

—What _______ the number of the students in your school?    —About two thousand. A number of them _______ from the countryside.     A. is; are      B. is: is    C. are; is    D. are: are 答案：A一辆汽车由甲地匀速驶往相距300千米的乙地，汽车的速度是100km／h，那么汽车距离甲地的路程s(km)与行驶时间t(h)的函数关系用图象可表示为