单选题
Gold which is 10 Karats in proportion ______ in the U.S.
A、
represents the highest grade of gold
B、
cannot be sold
C、
never carries a Karat quality mark
D、
represents the lowest-grade gold marketable
【正确答案】
D
【答案解析】
[分析] 细节题型。 见文中：The lowest Karat gold that can be marketed in the United States is 10-Karat gold．能够在美国市场上交易的黄金最低含金量不能低于10K。因此选项D；“10K，的黄金是美国能够上市的最低级别的黄金。”是答案。
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