单项选择题

Questions 7 to 10 are based on the following conversation. At the end of the conversation, you will be given 20 seconds to answer the questions.
Now, listen to the conversation.
It was necessary to replace the old standard weight because

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 7 to 10 are based on the following conversation. At the end of the conversation, you will be given 20 seconds to answer the questions. Now, listen to the conversation. It was necessary to replace the old standard weight because 您的浏览器不支持 audio 元素。