【題目】It is a golden rule in international trade that if you export nothing but raw materials, you're at the ________ of world prices.

A. riskB. expenseC. mercy D. cost

【答案】C

【解析】

試題分析：考查固定短語。句意：這是國際貿(mào)易中的一個黃金法則，如果你只出口原材料，你就受到世界價格的擺布了。at the mercy of“任……擺布，在……前毫無辦法”，故選C項。

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