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
Dogs and cats are similar in that________.
A．people can use them for hunting
B．they are associated with man closely
C．they have the same way of living
D．they are equally liked by people
单项选择题
A．The man seems to have no back and from the side can barely be seen.B．The man is smaller than the tiger itself.C．The man smells bad.D．The man looks very much like a deer.
A．The man seems to have no back and from the side can barely be seen.
B．The man is smaller than the tiger itself.
C．The man smells bad.
D．The man looks very much like a deer.
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