题目

在平面直角坐标系中，已知两点A（cos80°，sin80°），（cos20°，sin20°），则|AB|的值是……………………………（    ）  （A）                                                     （B）（C）                                                   （D）1 答案：D听下面一段材料，回答第1-题。1.  What's the relationship between the two speakers?A.  Teacher and student.    B.  Brother and sister. C.  Father and daughter. 2.  Why will the girl try harder to learn English?A.  Because she got a bad grade last time. B.  Because she is under the pressure of her parents. C.  Because she has known the importance of English.