A:b>2
B:﹣2<b<2
C:b>2或b<﹣2
D:b<﹣2
(____)(1)A. first B.second C. three
(____)(2)A. classroom B.play C. playground
(____)(3)A. heavy B. high C. school
(____)(4)A. on B.in C. me
(____)(5)A.floor B. push C. swing
Sometimes we saw stars _____brightly____ in the sky.
文明交往的前提是( )