单项选择题
A.foehn B.chinook C.land breeze D.sea breeze
A line on a weather chart connecting places which have ...
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
A feature of an inflatable raft which helps keep people...
单项选择题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
A cold front moving in from the northwest can produce（）...
单项选择题A cold front moving in from the northwest can produce（）.
A.thunderstorms，hail，and then rapid clearing B.increasing cloud cover lasting for several days C.lengthy wet weather D.low ceilings with thick cirrus clouds
