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.
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When does the conversation take place
A．On Friday.
B．On Thursday.
C．On Tuesday.
D．On Monday.
单项选择题
What was the temperature at Arm Arbor airport
A．79 Degrees F.
B．74 Degrees F.
C．75 Degrees F.
D．73 Degrees F.
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