单项选择题

Little or no change in the barometric reading over a twelve hour period indicates（）.

A.stormy weather is imminent
B.that present weather conditions will continue
C.a defect in the barometer
D.increasing wind strength

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单项选择题

A.moderate but easily navigated
B.calm
C.mountainous and confused
D.mountainous but fairly regular as far as direction is concerned

单项选择题

A.high relative humidity
B.frequent showers and thunderstorms
C.steep pressure gradients
D.frequent calms

单项选择题

A.steady，constant winds
B.frequent rain showers and thunderstorms
C.steep pressure gradients
D.low relative humidity