题目

设是等比数列的前项和为，则的值为（   ） A．或    B．或       C．或        D．或 答案：C 【解析】 试题分析：，故选C． 考点：等比数列．   My pen pal Peter came to Beijing 3 months ago. There days he   1.  (learn) Chinese in a language school. He likes travelling. And he   2.   already      (visit) many great places of interest in our country. Next month, he   3.   (fly) to Harbin for the summer vocation. I am sure he will have a good time.