单项选择题

A.lapse rateB.isobarC.frontD.continentA boundary betwee……

A boundary between two air masses is a(n)（）.

A.lapse rate
B.isobar
C.front
D.continent

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单项选择题（）causing strong winds and rough sea north west Bay of Biscay.

A.Strong low pressure
B.Strong high pressure
C.Steep pressure gradient
D.Steep gradient pressure