下列命题中是假命题的是( )
A.∀x∈R,2x-1>0
B.∀x∈N﹡,(x-1)2>0
C.∃x∈R,lgx<1
D.∃x∈R,tanx=2
B中,x=1时不成立,故选B
答案:B
Do you know ______ there are any good restaurants ______ this block?[ ]
A. if, on
B. how, on
C. if, to
D. where, to
A.UA不变,UB变小
B.UA增大,UB不变
C.UA增大,UB变小
D.UA不变,UB增大