题目

 —What were you doing at this time yesterday?  —We _______ in the classroom.          A. read                       B. were reading          C. are reading           答案：B下列哪一种行为不属于先天性行为A.蜜蜂采蜜B.蜘蛛结网C.大山雀偷饮牛奶D.喜鹊筑巢