A.a specific barometric pressureB.a specific temperatur……

单项选择题Recurvature of a hurricane’s track usually results in the forward speed（）.

A.increasing
B.decreasing
C.remaining the same
D.varying during the day

单项选择题Prevailing winds between 30°N and 60°N latitude are from the（）.

A.north
B.south
C.east
D.west

单项选择题Plain language is usually used on marine weather（）.

A.forecasts
B.observations
C.analyses
D.reports

单项选择题On the pole side of the high pressure belt in each hemisphere，the pressure diminishes. The winds along these gradients are diverted by the Earth’s rotation toward the east and are known as the（）.

A.geostrophic winds
B.doldrums
C.horse latitudes
D.prevailing westerlies

单项选择题On a working copy of a weather map，a cold front is represented by what color line? （）

A.Red
B.Blue
C.Alternating red and blue
D.Purple