单项选择题

A mercurial barometer at sea is subject to rapid variations in height (pumping) due to the pitch and roll of the vessel. To avoid this error，measurements of atmospheric pressure at sea are usually measured with a(n)（）.

A.syphon barometer
B.cistern barometer
C.aneroid barometer
D.fortin barometer

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单项选择题
A low，uniform layer of cloud resembling fog，but not resting on the ground，is called（）.

A.cumulus
B.nimbus
C.stratus
D.cirrus
单项选择题
A local wind which occurs during the daytime and is caused by the different rates of warming of land and water is a（）.

A.foehn
B.chinook
C.land breeze
D.sea breeze
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