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 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.
单项选择题
What is the main topic of the conversation
A．The woman's performance in her classes.
B．The woman's nomination for an award.
C．The professor's offer to help prepare the woman for an interview.
D．The results of the professor's meeting with the woman's other teachers.
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