()是人们对点心的第一印象,诱人的色泽能提高顾客的购买欲望。
A、色
B、香
C、形
D、味
参考答案:A
已知函数f(x)=x3+ax2+bx+c(a,b,c∈R),当且仅当x=1,x=-1时,f(x)取得极值,并且极大值比极小值大c.
(1)求常数a,b,c的值;
(2)求f(x)的极值.
Because it was too dark at night, I could see ______ people on the street.
A. few B. a few C. little D. a little