已知△ABC内一点O满足 $\overrightarrow{OA}+2\overrightarrow{OB}+3\overrightarrow{OC}$ = $\overrightarrow{0}$ ，若△ABC内任意投一个点，则该点△OAC内的概率为（  ）

    I am a s____ of Park School. I am from A____. I am now living in a big c____. I live near school. I go to school on f____. It takes me only ten m____. I live far away from the library. I get t____ by bus. It takes me a____ half an hour. I live far away from City Park. I get there by u____. It takes me about t____ minutes. I go to school e____ every morning. Then I do some cleaning in the classroom. I f____ classes at about half past three in the a____. Then I walk h____.