A:氧气
B:氮气
C:稀有气体
D:二氧化碳
It will be hard for us to get up in the morning if we ___________ to bed too late.
已知二次函数f(x)满足f(x+1)﹣f(x)=2x﹣1,且f(0)=3.
(1)求f(x)的解析式;
(2)若函数y=f(log3x+m),x∈13,3的最小值为3,求实数m的值;
(3)若对任意互不相同的x1,x2∈(2,4),都有|f(x1)﹣f(x2)|<k|x1﹣x2|成立,求实数k的取值范围.