问题
单项选择题
If gold is marked with a Karat quality mark, it must also bear ______.
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
参考答案：B
解析：[分析] 细节题型。 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。