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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 gold is marked with a Karat quality mark, it must also bear ______.
选项 A、a national gold and silver stamp
B、the registered trademark of the entity standing behind the mark
C、a "made in the USA" mark
D、a percentage mark
答案B
解析 见文中：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…如果黄金饰品上标有开/K纯度的质量标志，紧挨这个标志的后面一定要有某个在美国注册的个人或公司的商标。选项B与此同义，故为答案。
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