单项选择题

How is 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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单项选择题

The man intends to

A．go back alone by bus.
B．go with the woman by bus.
C．go with the woman by taxi.
D．go with the woman by car.

单项选择题

How does the woman explain the procedure

A．By referring to the handbook for the procedure.
B．By quoting what the professor had said about it.
C．By giving examples of her procedures.
D．By comparing it to the old procedure.