单选题The dense black cumulonimbus clouds surrounding the eye of a hurricane are called（）.ASpiral rainbandsBCloud wallsCFunnel cloudsDCyclonic spirals
单选题
The dense black cumulonimbus clouds surrounding the eye of a hurricane are called（）.
A
Spiral rainbands
B
Cloud walls
C
Funnel clouds
D
Cyclonic spirals
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Cumulonimbus clouds are most likely to accompany a(n) ______.A.high pressure systemB.cold frontC.warm frontD.occluded front
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
The dense black cumulonimbus clouds surrounding the eye of a hurricane are called ______．A.Spiral rainbandsB.Cloud wallsC.Funnel cloudsD.Cyclonic spirals
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
Altocumulus clouds are defined as______．A.high cloudsB.middle cloudsC.low cloudsD.vertical development clouds
All of the following are associated with cumulonimbus clouds EXCEPT ______.A.steady rainfallB.hail stormsC.thunderstormsD.tornadoes or waterspouts
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
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
共用题干Black HolesMost scientists agree that black holes exist but are nearly impossible to locate.A black hole in the universe is not a solid object,like a planet,but it is shaped like a sphere（球体）. Astronomers（天文学家）think that at the center of a black hole there is a single point in space with infinite（无限的）density（稠密）.This single point is called a singularity（奇点）. If the singularity theory is correct,it means that when a massive star collapses,all the material in it disappears into the singularity.The center of a black hole would not really be a hole at all,but an infinitely dense point.Anything that crosses the black hole is pulled in by its great gravity.Although black holes do exist,they are difficult to observe.These are the reasons.No light or anything else comes out of black holes.As a result,they are invisible to a telescope.In astronomical terms,black holes are truly tiny.For example,a black hole formed by the collapse of a giant star would have an event horizon（视界）only 18 miles across.The nearest black holes would be dozens of light years away from Earth.One light year is about 6 trillion（万亿）miles. Even the most powerlul telescopes could not pick out an object so small at such a great distance.In 1994 the Hubble Space Telescope provided evidence that black holes exist.There are still answers to be found,however,so black holes remain one of the mysteries of the universe.The nearest black holes are hundreds of light years away from us.A:Right B:Wrong C:Not mentioned
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单选题All of the following are associated with cumulonimbus clouds EXCEPT（）.Asteady rainfallBhail stormsCthunderstormsDtornadoes or waterspouts
单选题Cumulonimbus clouds are formed by（）.Avertical air movementsBheavy rainstormsChorizontal air movementsDany movement of moist air
单选题Cumulonimbus clouds can produce（）.Adense fog and high humidityBgusty winds，thunder，rain or hail，and lightningCclear skies with the approach of a cold frontDa rapid drop in barometric pressure followed by darkness
单选题The eye of a hurricane is surrounded by dense black cumulonimbus clouds which are called the（）.AWall cloudBNimbostratus cloudCBarDFunnel
单选题Altocumulus clouds are defined as（）.Ahigh cloudsBmiddle cloudsClow cloudsDvertical development clouds
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单选题The first indications a mariner will have of the approach of a warm front will be （）.Alarge cumulonimbus (thunderclouds) building upBhigh cirrus clouds gradually changing to cirrostratus and then to altostratusCfog caused by the warm air passing over the cooler waterDlow dark clouds accompanied by intermittent rain
单选题We can conclude from the last paragraph that______.Atrade winds are harmful to the low clouds.Bdeep clouds are helpful to cool the earth.Cglobal warming can result in more low clouds.Dglobal warming can destroy the form of atmosphere.
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?（）.ACumulus clouds lined up in rows extending in a northeast to southwest directionBHigh altostratus clouds in the morning hoursCCirrostratus clouds lined up in rows extending in a northeast to southwest directionDCirrostratus clouds lined up in rows extending in a north to south direction
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（）.Abar of the stormBeye of the stormCfunnelDfront