A:don’t you
B:will they
C:don’t they
D:will you
水和空气都是人类重要的资源.
(____) What does your mother do?
(____) Oh, great!
(____) She's a nurse.
(____) Look! This is my mother.
(____) Oh! She's beautiful.
如果(m+3)x>2m+6的解集为x<2,则m的取值范围是( )
小叶在北京饭店大堂的时钟上看见四个国家首都在同一时刻时间不同,其原因是由于( )