单项选择题

What is the conversation mainly about

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
What is the main topic of the conversation
A．The dances of a Native American dance troupe.
B．How Native American ceremonial dances are classified.
C．Variations of a basic dance among Native American tribes.
D．How Native American artists are traine
单项选择题
What does Dr. Thomas probably think about the cost of the new weight
A．It is a small amount to pay for so much precious metal.
B．It is difficult to judge the value of such an object.
C．It is reasonable for an object with such an important function.
D．It is too high for such a light weight.
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