单项选择题

Questions 17 to 20 are based on the following telephone interview. You now have 15 seconds to read Questions 17 to 20.
What does the conversation mainly discuss

A．How to care for precious metals.
B．A standard unit for measuring weight.
C．The value of precious metals.
D．Using the metric system.

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单项选择题

单项选择题

Questions 17 to 20 are based on the following telephone interview. You now have 15 seconds to read Questions 17 to 20. What does the conversation mainly discuss 您的浏览器不支持 audio 元素。