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 change
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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 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
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