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单选题
Cumulonimbus clouds are formed by（）.
A
vertical air movements
B
heavy rainstorms
C
horizontal air movements
D
any movement of moist air
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考题
Cumulonimbus clouds are most likely to accompany a(n) ______.A.high pressure systemB.cold frontC.warm frontD.occluded front
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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
考题
The dense black cumulonimbus clouds surrounding the eye of a hurricane are called ______．A.Spiral rainbandsB.Cloud wallsC.Funnel cloudsD.Cyclonic spirals
考题
Clouds with the prefix“nimbo”in their name ______．A.are sheet or layer cloudsB.have undergone great vertical developmentC.are middle or high altitude cloudsD.are rain clouds
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Cumulus clouds that have undergone vertical development and have become cumulonimbus in form，indicate ______．A.clearing weatherB.that a warm front has passedC.probable thunderstorm activityD.an approaching hurricane or typhoon
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What is the first visible indication of the presence of a tropical cyclone or hurricane ________．A.Stratocumulus clouds or strange birdsB.Rain and increasing windsC.An exceptionally long swellD.Dark clouds and the“bar”of the storm
考题
Altocumulus clouds are defined as______．A.high cloudsB.middle cloudsC.low cloudsD.vertical development clouds
考题
Cumulonimbus clouds can produce ______.A.dense fog and high humidityB.gusty winds, thunder, rain or hail, and lightingC.clear skies with the approach of a cold frontD.a rapid drop in barometric pressure followed by darkness
考题
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.cirrusB.cirrocumulusC.altostratusD.Cumulonimbus
考题
单选题Clouds with the prefix “nimbo” in their name（）.A
are sheet or layer cloudsB
have undergone great vertical developmentC
are middle or high altitude cloudsD
are rain clouds
考题
单选题All of the following are associated with cumulonimbus clouds EXCEPT（）.A
steady rainfallB
hail stormsC
thunderstormsD
tornadoes or waterspouts
考题
单选题The dense black cumulonimbus clouds surrounding the eye of a hurricane are called（）.A
Spiral rainbandsB
Cloud wallsC
Funnel cloudsD
Cyclonic spirals
考题
单选题Cumulonimbus clouds are formed by（）.A
vertical air movementsB
heavy rainstormsC
horizontal air movementsD
any movement of moist air
考题
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
考题
单选题The eye of a hurricane is surrounded by dense black cumulonimbus clouds which are called the（）.A
Wall cloudB
Nimbostratus cloudC
BarD
Funnel
考题
单选题（）is formed when the droplets or ice crystals in clouds have become sufficiently large to fall to the ground.A
HumidityB
TemperatureC
PrecipitationD
Wind
考题
单选题Altocumulus clouds are defined as（）.A
high cloudsB
middle cloudsC
low cloudsD
vertical development clouds
考题
单选题What is the first visible indication of the presence of a tropical cyclone or hurricane（）.A
Stratocumulus clouds or strange birdsB
Rain and increasing windsC
An exceptionally long swellD
Dark clouds and the“bar”of the storm
考题
单选题Cumulus clouds that have undergone vertical development and have become cumulonimbus in form，indicate（）.A
clearing weatherB
that a warm front has passedC
probable thunderstorm activityD
an approaching hurricane or typhoon
考题
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
考题
单选题We can conclude from the last paragraph that______.A
trade winds are harmful to the low clouds.B
deep clouds are helpful to cool the earth.C
global warming can result in more low clouds.D
global warming can destroy the form of atmosphere.
考题
单选题The new study published in Science indicates that______.A
low-level clouds tend to warm the ocean.B
more cloud cover means a warmer world.C
the warming of ocean is a threat to the low-level clouds.D
the Pacific Ocean has more low-level clouds than before.
考题
单选题In the Northern Hemisphere，what type of cloud formations would you expect to see to the west of an approaching tropical wave?（）.A
Cumulus clouds lined up in rows extending in a northeast to southwest directionB
High altostratus clouds in the morning hoursC
Cirrostratus clouds lined up in rows extending in a northeast to southwest directionD
Cirrostratus clouds lined up in rows extending in a north to south direction
考题
单选题The inner cloud bands of a hurricane，when viewed from a distance，form a mass of dense，black cumulonimbus clouds called the（）.A
bar of the stormB
eye of the stormC
funnelD
front
考题
单选题We watched the plane（）behind the clouds.A
disappearingB
disappearedC
divingD
dived
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