题目

Your parents have a deep affection for you. Even if they are , they can still keep out the wind and rain for you. A . as cool as cucumbers B . as strong as horses C . as poor as church mice D . as busy as bees 答案：C某校高中部高一年级500人，高三年级300人，现采用分层抽样的方法从高中部全体学生中随机抽取110人，其中从高一年级中抽取50人，则高二年级的人数为（ ）A.900B.700C.500D.300