题目

— Are you glad that you came to Jilin？ — Yes, indeed． I ________ going to Dalian or Shenyang, but I’ve never regretted my decision．        A． have considered                                       B． am considering             C． had considered                                        D． was considering已知点（n，an）（n∈N*）在函数f（x）=-6x-2的图象上，数列{an}的前n项和为Sn．（Ⅰ）求Sn；（Ⅱ）设cn=an+8n+3，数列{dn}满足d1=c1，dn+1=cdn（n∈N*）．求数列{dn}的通项公式；（Ⅲ）设g（x）是定义在正整数集上的函数，对于任意的正整数x1、x2，恒有g（x1x2）=x1g（x2）+x2g（x1）成立，且g（2）=a（a为常数，且a≠0），记bn=g(dn+12)dn+1，试判断数列{bn}是否为等差数列，并说明理由．