题目

 The newly built washingroom in the railway station is         to the disabled passengers. A.perfect      B.accessible     C.remarkable       D.potential 答案：B 已知函数f(x)＝x2＋bx的图像在点A(1，f(1))处的切线的斜率为3，数列的前n项和为Sn，则S2012的值为 [　　] A． B． C． D．