① put litter into the dustbin
② stay up reviewing lessons all the time
③ go to school without breakfast
④ wash hands before meals
⑤ open the window and take a fresh breath as often as possible
A:①④⑤
B:②③④
C:①②⑤
在正方体ABCD-A1B1C1D1中,下列各式中运算的结果为向量AC1→的共有( )①;(AB→+BC→)+CC1→②(AB→+AD→)+AA1→;③(AB→+BD→)+DC1→;④(AA1→+AB1→+A1D1→.
孟子说:“君有过则谏,反覆之而不听,则去。”而董仲舒说:“唯天子受命于天,天下受命于天子。”相对于孟子,董仲舒的主张 ( )
如果有经济困难,无力支付法律服务费用,又需要打官司来讨回公道,则应当( )