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【单选题】
人类社会进步和科学技术与生产发展的动力源泉是对商品或服务（）。A.
需求的无限性
B.
需求的有限性
C.
欲望的无限性
D.
欲望的有限性
拍照语音搜题，微信中搜索"皮皮学"使用
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【简答题】Robert Burns is the most famous poet to write in Scots, the traditional language of Scotland. Born in Ayrshire, Scotland to a poor farming family, his parents made sure that he was well educated as a ...