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  3. The "Karat" marking on jewelry tells you what proportion of gold is mixed with other metals. If 14 parts of gold are mixed with

The "Karat" marking on jewelry tells you what proportion of gold is mixed with other metals. If 14 parts of gold are mixed with

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问题     The "Karat" marking on jewelry tells you what proportion of gold is mixed with other metals. If 14 parts of gold are mixed with 10 parts of base metal, the combination is called 14 Karat (14K) gold. The higher the Karat rating, the higher the proportion of gold in the object. The lowest Karat gold that can be marketed in the United States is 10-Karat gold. Jewelry does not have to be marked with its Karat quality, but most of it is. If there is a Karat quality mark, next to it must be the U.S. registered trademark of the person or company that will stand behind the mark, as required by the National Gold and Silver Stamping Act.
If a ring is stamped 24K, it has ______.
选项 A、204 parts of gold
B、24 parts of gold
C、two and four-tenths parts of gold
D、10 parts of gold
答案B
解析 见文中第二句：If 14 parts of gold are mixed with 10 parts of base metal，the combination is called 14-Karat(14K)gold．如果将14份黄金与10份普通金属混合，它们的化合物即14K金。由此可推论24K金应为24份黄金与10份普通金属混合。所以选项B．“如果一只戒指上刻24K，它应含有24份黄金。”是答案。
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