单项选择题

A．To measure amounts of rainfall,
B．To check the accuracy of scales.
C．To observe changes in the atmosphere.
D．To calculate the density of other metals.
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单项选择题
A．Tuesday, Thursday and Friday.B．Monday, Thursday and Friday.C．Monday, Wednesday and Friday.D．Monday, Wednesday and Thursday.
A．Tuesday, Thursday and Friday.
B．Monday, Thursday and Friday.
C．Monday, Wednesday and Friday.
D．Monday, Wednesday and Thursday.
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