A:sick; sicking
B:ill; sick
C:ill; ill
D:sick; ill
初中生应关注国家政治生活,包括参加基层人大民主选举。( )
1970年,联邦德国和波兰签订条约,实现了两国关系正常化;签约当天联邦德国总理勃兰特为表示诚意,在华沙犹太人受难者纪念碑前下跪献花。这些外交活动
—— Datou Ge Hongyu made few mistakes in the competition of singing, ________ ?—— _____________. I think his perform was the most wonderful in The Voice of China.
(Ⅰ)求证: {1an+1} 是等比数列,并求{an}的通项公式an;
(Ⅱ)数列{bn}满足 bn=(2n−1)⋅n2n−1⋅an ,数列{bn}的前n项和为Tn,若不等式 (−1)nλ<Tn+n2n−1 对一切n∈N*恒成立,求λ的取值范围.