单项选择题
If the price is too high, what do you say to get a lower price?
未知题型 教师基于电子教材的备课，可以拖拽平台上的教学资源至电子教材页面上（）
未知题型 Marketing researchers and marketing managers are crossing the boundary into each others" fields by taking on more responsibilities.
单项选择题 西子蒙不洁，则人皆掩鼻而过之出自哪位文人（）
