题目

Eric Smith is my friend.(改为同义句)Eric Smith. 答案：【1】My【2】friend【3】is(2014·郑州模拟)等差数列{an}中,2a3-+2a11=0,数列{bn}是等比数列,且b7=a7,则b6b8=(　　)A．2B．4C．8D．16