Please _________ my keys here, I need them.
A:bring
B:answer
C:found
D:lost
指出下列四条食物链中,正确的是( )
已知函数f(x)=|x+2|﹣2|x﹣1|
(1)解不等式f(x)≥﹣2;
(2)对任意x∈a,+∞),都有f(x)≤x﹣a成立,求实数a的取值范围.