<p><a href="http://study.teacheredu.cn/proj/studentwork/swap/communicate_view_new.htm?id=219389&ptcode=40001" target="_blank" style="color: rgb(0, 0, 0); word-wrap: break-word; font-size: 18px; display: block; font-family: 微软雅黑; text-align: justify; white-space: normal; background-color: rgb(255, 255, 255);">Unit 4 Where’s my schoolbag教学难点是什么?</a></p>