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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A.cumulus
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C.stratus
D.cirrus -
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A local wind which occurs during the daytime and is caused by the different rates of warming of land and water is a（）.
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A line on a weather chart connecting places which have the same barometric pressure is called an（）.
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