国开《综合英语(1)》Unit6 单元练习 形考试题 【题目】The author mentions food, tools and precious metals and stones together because they are all material objects useful items articles of value difficult things to obtain 试题来源综合英语(1) 查看整套课程试卷 此内容查看价格为0.2金币，请先登录如有问题，请联系微信客服解决！
