单项选择题

Questions 22～25 are based on the following telephone interview. 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

单项选择题

Questions 22～25 are based on the following telephone interview. Why was it necessary to replace the old standard weight 您的浏览器不支持 audio 元素。