单项选择题

A．They know what they want to buy.
B．They have little money to spend.
C．They talk themselves out of purchase.
D．They shop at the cheapest stores.
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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.
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.
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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