单项选择题

A．A third.
B．Two thirds.
C．Half of the total.
D．Almost all.
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单项选择题
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.
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.
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