— What do you know ________ Canadians?

— I know they ________ English and French. [ ]

A. at, speak

B. of, say

C. of, speak

D. about, say

最佳适应算法的空白区是______。

A．按大小递减顺序排列

B．按大小递增顺序排列

C．按地址由小到大排列

D．按地址由大到小排列