题目

The number 2008 is a special number, ________ I think, that will be remembered by the Chinese forever. A. which           B. what           C. one        D. it   答案：C2．在△OAB中，C是线段AB上一点，且CB=2AC，设$\overrightarrow{OA}$=$\overrightarrow{a}$，$\overrightarrow{OB}$=$\overrightarrow{b}$，试用$\overrightarrow{a}$，$\overrightarrow{b}$表示$\overrightarrow{OC}$．