单项选择题

A．To measure amounts of rainfall.
B．To cheek the accuracy of scales.
C．To observe changes in the atmosphere.
D．To calculate the density of other metals.
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A．A druggist’s suggestion.B．An article.C．An advertisement.D．A sales clerk’s comment.
A．A druggist’s suggestion.
B．An article.
C．An advertisement.
D．A sales clerk’s comment.
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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