原式=3×3+|-3×12|-(22)2,
=3+32-12,
=4.
故答案为:4.
(2013·皖南八校第一次联考)He is only too ready to help others, seldom, ________, refusing them when they turn to him.
A.if never
B.if ever
C.if not
D.if anything
请问左镇人的性别和年龄?