题目

 The first textbooks written for teaching English as a foreign language _______in the 16th century.    A. came about             B. came out           C. came along        D. came up 答案：B如图3，△ABC中，∠C＝90°，AD平分∠BAC，AB＝5，CD＝2，则△ABD的面积是______．A．6B．5C．10D．8