选出你所听到的句子( )
A:Don't talk about him any more.
B:Don't make jokes about him any more.
C:Don't say anything about him any more.
①消费水平不断提升
②恩格尔系数不断提高
③消费以享受资料消费为主
④消费结构得到改善
已知a,b是实数,则“a>0且b>0”是“a+b>0且ab>0”的( )
读下面四国图,回答下面小题。
甲 乙 丙 丁
我国人口最多的少数民族是( )