①微博议政开辟了公民行使民主权利的新途径
②微博议政说明了公民参政议政意识的增强
③只有网络才能搜集到真实的社情民意
④微博议政有利于公民直接参与国家事务的决策
A:①②
B:②④
C:①③
D:③④
设y=kx+b,当x=1时,y=1;当x=2时,y=﹣4.则k、b的值为( )
—Hi, Bob! What's going on over there?
—Oh, Tom and Dick are playing chess, with a crowd of students watching them.