Money is a(n)______for buying and selling in a economic system and serves
单选题Money is a(n)______for buying and selling in a economic system and serves as the center of the monetary system.
A.means
B.method
C.instrument
D.medium
参考答案：D
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答案解析：近义词语义辨析。题干意为“货币是经济体系中买卖的______，是货币体系的中心”，选项中只有medium（媒介，中介）的语义能构成符合上下文语义逻辑的搭配，故只有D选项符合题意。
