题干
——David, could you tell me _________?
——Every four years.
A：when the 2014 World Cup will finish
B：how often the World Cup takes place
C：how many teams take part in the World Cup
D：who may score the most goals in the World Cup
答案(点此获取答案解析）
B
是公比为正数的等比数列，若
，则数列