This box is_______ that one.
A:heavy than
B:so heavy than
C:heavier as
D:as heavy as
(Ⅰ)若a=1,求不等式f(x)>x+2的解集;
(Ⅱ)若不等式f(x)≤a(x+2)的解集为非空集合,求a的取值范围.
A.9000左右 B.21000左右
C.6000左右 D.12000左右