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
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单项选择题

A cold front moving in from the northwest can produce（）.

A.thunderstorms，hail，and then rapid clearing
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（）rain means it rains in some parts of the area.

A.Squally
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D.Occasional