单项选择题
儿童对物品抓、舔咬、摇动、敲打，属于符号形式与指示内容关系的( ) A．阶段1 B．阶段2 C．阶段3 D．阶段4 E．阶段5
单项选择题 We are ______ you for the special offer you send us. A．thank B．appreciate C．grateful for D．indebted to
单项选择题 肺的生理特性为( ) A．喜清肃 B．喜和降 C．喜燥恶湿 D．喜润恶燥 E．喜闭藏
单项选择题 We ______ your special offer you have sent us. A．thank B．appreciate C．be grateful D．be indebted
