单项选择题

Questions 17 to 20 are based on the following telephone interview. You now have 15 seconds to read Questions 17 to 20.
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 17 to 20 are based on the following telephone interview. You now have 15 seconds to read Questions 17 to 20. Why was it necessary to replace the old standard weight 您的浏览器不支持 audio 元素。