—No,I won't.I know that ______ of us are perfect after all.
A:none
B:neither
C:each
D:all
下图反映西亚石油分布的中心位于( )
函数f(x)=x2-x-2,x∈-5,5,那么在区间-5,5中任取一个值x0,使f(x0)≤0的概率为( )