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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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热门试题

单项选择题How was the weight used

A．To check the accuracy of scales.
B．To calculate the density of other metals.
C．To observe changes in the atmosphere.
D．To measure amounts of rainfall.

单项选择题What will the woman receive if she is chosen

A．A certificate signed by three professors.
B．A cash award and a certificate,
C．A medal worth five hundred dollars.
D．An opportunity to interview for an excellent position.