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
A．Working too long.B．Accumulated stress.C．Bad sleeping habits.D．Anti-social lifestyles.
A．Working too long.
B．Accumulated stress.
C．Bad sleeping habits.
D．Anti-social lifestyles.
单项选择题
A．Putting a roof on a barn.B．Harvesting water reeds.C．Using stone as a building material.D．Daily farm operations.
A．Putting a roof on a barn.
B．Harvesting water reeds.
C．Using stone as a building material.
D．Daily farm operations.
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