题目

---Could you tell me ___ all of you think of your teacher?  ---She’s a good teacher. A. whether    B.how     C. if     D. what 答案：D 解析: 从答句可知，用于what do you think of sb/sth.？你认为…怎么样?所以选 what.如图，等腰三角形ABC的顶角为1200，底边BC上的高AD= 4，则腰长为____．