Hurricane warnings are issued（）when winds of force 12 or above are expected.

单项选择题High pressure ridge（）from Sevastopol to eastern Libya.

A.reaching
B.extending
C.increasing
D.upgrading

单项选择题High clouds，composed of small white flakes or scaly globular masses，and often banded together to form a mackerel sky，would be classified as（）.

A.cirrus
B.cirrocumulus
C.altostratus
D.cumulonimbus

单项选择题Good weather is usually associated with a region of（）.

A.low barometric pressure
B.high barometric pressure
C.falling barometric pressure
D.pumping barometric pressure

单项选择题Generally speaking，with（）the weather becomes cloudy or overcast with strong winds.

A.high pressures
B.low pressures
C.weak pressures
D.strong pressures

单项选择题For an accurate barometer check，you would（）.

A.check it with a barometer on another vessel
B.take readings from several barometers and average them
C.check it with the barometer at the ship chandlery
D.check it against radio or National Weather Service reports of the immediate vicinity