— will the 6th Chinese Film Festival in France last?
—From May 24th to July 19th.
A:How often
B:How soon
C:How long
D:How many
已知数列{an}的各项均为正数,前n和为Sn,且Sn= (an+2)(an−1)2 (n∈N*).
青年,特别是青少年学生,总是用他们满腔热血与辛勤汗水书写着永不退色的青春传奇。1919年就是这样一群青年揭开了一个时代的序幕。“一个时代”是( )