顾客最基本、也是最主要的购买动机是（）。
A.实用、省时、经济
B.利于健康
C.安全、舒适、方便
D.喜爱、认可
参考答案：A
关于妊娠滋养细胞疾病，不包括哪种疾病：
A．葡萄胎B．侵蚀性葡萄胎C．绒毛膜癌D．胎盘部位滋养细胞肿瘤E．卵巢绒癌
We are pleased to know that you have planned to come to the Autumn Guangzhou Fair. We wish to discuss with you some other important things if you could come ______ your earliest convenience.
A．by
B．on
C．in
D．at
