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

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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
单项选择题
A line on a weather chart connecting places which have the same barometric pressure is called an（）.

A.isotherm
B.isallobar
C.isobar
D.isotope
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