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参考答案：
【小题22】B
【小题23】A
【小题24】B
【小题25】D
习题解析：
【小题22】听力原文开头指出希腊哲学家亚里士多德对钱币的特征做过描述，提到It must be lasting and easy to recognize, to divide, and to carry about.即钱币必须具有持久性、易于辨认、分割、携带，选项B符合原文，故为答案。
【小题23】听力原文中提到Among isolated people,... commerce usually means barter. For this kind of simple trading, money is not needed...，即有些与世隔绝的人通常不使用钱币进行交易，对于他们来说商业就是以物易物，故选项A为答案。
【小题24】听力原文提到Salt may seem rather a strange substance to use as money, but in countries where the food of the people is mainly vegetable, it is often an absolute necessity.由此可知，在一些以蔬菜为食的国家，盐是一种必需品，他们往往会用盐作为媒介进行交易，故选项B为答案。另外三个选项属于利用原文信息张冠李戴设置的干扰。
【小题25】听力原文提到The early money of China, apart from shell, was of bronze, often in flat, round pieces with a hole in the middle, called "cash". 由此可知，中国早期被称为“现钱”的货币是中间带孔的圆形铜钱，故选项D为答案。
