题目

____________ your friend Anna _____________ a CD player?         A. Do, have     B. Do, has   C. Does, has    D. Does, have 答案：D 已知等比数列{an}的公比为正数，且a3·a9＝2a，a2＝1，则a1＝ [　　] A． B． C． D． 2