国际长途开通、取消均()效,对外宣传不超过24小时
参考答案:立即生效
下列结论错误的是( )
A.命题“若p,则q”与命题“若¬q,则¬p”互为逆否命题
B.命题p:∀x∈[0,1],ex≥1,命题q:∃x∈R,x2+x+1<0,则p∨q为真
C.若p∨q为假命题,则p、q均为假命题
D.“若am2<bm2,则a<b”的逆命题为真命题
Happily for the boy's parents, he is working harder and harder to________ his lost time.[ ]
A. make up for
B. catch up with
C. make use of
D. keep up with