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.
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单项选择题
Pop Art was connected with material goods.
A．Y
B．N
C．NG
单项选择题
A．He is not to blame.B．He was responsible for the accident.C．He will take all the responsibility.D．He will be more careful next time.
A．He is not to blame.
B．He was responsible for the accident.
C．He will take all the responsibility.
D．He will be more careful next time.
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