单选题An aneroid barometer is an instrument（）.Aused to measure the speed of windBin which the pressure of the air is measuredCthat tells which direction a storm is coming fromDused to measure the height of waves
单选题
An aneroid barometer is an instrument（）.
A
used to measure the speed of wind
B
in which the pressure of the air is measured
C
that tells which direction a storm is coming from
D
used to measure the height of waves
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