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单选题
On the approach of a warm front the barometric pressure usually（）.
A
falls
B
rises
C
is steady
D
is unreliable
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单选题Cyclones tend to move（）.A
perpendicular to the isobars in their warm sectorsB
parallel to the isobars in their warm sectorsC
parallel to the line of the cold frontD
perpendicular to the line of the cold front
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单选题As it approaches，a typical warm front will bring（）.A
rising temperatures and falling barometric pressureB
falling temperature and pressureC
falling temperatures and rising pressureD
rising barometric pressure and temperatures
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单选题An occluded front is usually caused by a（）.A
cold front becoming stationaryB
warm front becoming stationaryC
cold front overtaking a warm frontD
warm front dissipating
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单选题An occluded front is caused by a(n)（）.A
low pressure areaB
high pressure areaC
area of calm airD
cold front overtaking a warm front
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单选题Cumulonimbus clouds can produce（）.A
dense fog and high humidityB
gusty winds，thunder，rain or hail，and lightningC
clear skies with the approach of a cold frontD
a rapid drop in barometric pressure followed by darkness
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单选题Good weather is usually associated with a region of（）.A
low barometric pressureB
high barometric pressureC
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pumping barometric pressure
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单选题A decrease in barometric pressure is associated with all of the following except（）.A
rising warm airB
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rapidly improving weatherB
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a severe low pressure systemD
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单选题The first indications a mariner will have of the approach of a warm front will be （）.A
large cumulonimbus (thunderclouds) building upB
high cirrus clouds gradually changing to cirrostratus and then to altostratusC
fog caused by the warm air passing over the cooler waterD
low dark clouds accompanied by intermittent rain
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单选题Cyclones that have warm sectors usually move（）.A
westerlyB
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单选题Which of the following statements concerning frontal movements is TRUE（）.A
The temperature rises after a cold front passesB
The barometric pressure rises when a warm front passesC
A cold front generally passes faster than a warm frontD
A warm front usually has more violent weather associated with it than a cold front
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单选题A line on a weather chart connecting places which have the same barometric pressure is called an（）.A
isothermB
isallobarC
isobarD
isotope
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单选题After a cold front passes the barometric pressure usually（）.A
fluctuatesB
remains the sameC
remains the same，with clouds forming rapidlyD
rises，often quite rapidly，with clearing skies
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单选题After a cold front passes，the barometric pressure（）.A
drops，and the temperature dropsB
drops，and the temperature risesC
rises，and the temperature dropsD
rises，and the temperature rises
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