题干
25．The fire spread fast．Luckily the local government had brought it under control___the situation got worse．
A：though
B：until
C：before
D：Since
答案(点此获取答案解析）
C
时，
恒成立（
为函数g(x)的导函数）；②对任意x∈R都有g(x)=g(-x)。又函数f(x)满足：对任
意的x∈R都有f(
+x)=
成立，当x∈
,
时，f(x)=
。若关于x的不等式gf(x)≤g(
)对 x∈-
-2
,