单项选择题

Why was it necessary to replace the old standard weight

A．Someone spilled water on it.
B．Someone lost it.
C．It was made of low quality metal.
D．The standard for measuring had changed.
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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.
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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