The main resource of income for most newspapers is commercial advertising.

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问题 The main resource of income for most newspapers is commercial advertising.

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答案resource source

解析 此处指资金来源。resource指资源、物力、财力 ,往往用复数,如:The exploitation of natural resources was hampered by the lack of technicians.与of搭配的应当是source,表示来源。
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