A:优先发展煤炭工业
B:建立社会福利制度
C:重视提高国有化程度
D:加强政府对经济的干预
命题“∀x∈R,x2-3x+2≥0”的否定是( )
① The shoes are 20 yuan. ____ A.
② The shoes are 10 yuan. ____ B.
③ The skirt is nice.____ C.
④ The shoes are expensive. ____ D.