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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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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A feature of an inflatable raft which helps keep people stationary in rough weather is（）.
A.lashings on the floor of the raft for the passenger's feet
B.straps from the overhead
C.lifelines on the inside of the raft
D.ridges in the floor of the raft
