— Did you ______ much time watching Li Na's match last night?
— Yes. It ______ me a few hours to watch this match.
A:spend; spent
B:spend; took
C:take; took
D:take; cost
已知函数fx=13x3+x2+ax+1,若函数f(x)在区间﹣2,a上单调递增,则实数a的取值范围是____
阅读下面材料
材料:最近,小刚的班里来了一位英国的小男孩David,很快小刚就和他交上了朋友。David对丰富多彩的中国文化很感兴趣,不断向小刚学习中国文化,并且把英国文化介绍给小刚,虽然有时会出现矛盾,但他们相处得比较开心。
请你结合材料运用所学的知识回答: