单选题Cumulonimbus clouds are formed by（）.Avertical air movementsBheavy rainstormsChorizontal air movementsDany movement of moist air
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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Passage ThreeMany theories about the origin of the ocean have been proposed by scientists. The most widely accepted one is that the earth at some time in its very early history became hot enough to melt the materials from which it was formed. While in this molten state, lighter rock-forming materials (造岩材料) floated on the surface of the heavier ones. Then, between four and a half four billion (十亿) years ago, the molten earth cooled sufficiently to form. a crust of rock that was many miles thick.Surrounding the earth was an unbroken canopy of clouds miles thick and made up mostly of water vapor. Rain falling toward the still-hot earth was heated to steam and rose to the clouds again. After many millions of years, as the earth continued to cool, its surface temperature fell below the boiling point of water. Rainwater could now remain on the earth, covering its whole surface except for the higher places on earth that had been formed from the lighter rock materials.In 1970, scientists had pieced together evidence that the lighter rock materials had formed one huge continent by a vast ocean. Then, about 200 million years ago, the great continent began to break up, the pieces moving slowly apart.The onrushing waters of the single huge ocean now entered and filled the spaces between the separating continents--and became the several oceans and seas we know today.41. This passage mainly talks about ______.A. the origin of the earthB. the origin of the oceanC. the history of the earthD. the forming of the earth's crust
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
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
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
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
Altocumulus clouds are defined as______．A.high cloudsB.middle cloudsC.low cloudsD.vertical development clouds
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
单选题Clouds with the prefix “nimbo” in their name（）.Aare sheet or layer cloudsBhave undergone great vertical developmentCare middle or high altitude cloudsDare rain clouds
单选题All of the following are associated with cumulonimbus clouds EXCEPT（）.Asteady rainfallBhail stormsCthunderstormsDtornadoes or waterspouts
单选题The dense black cumulonimbus clouds surrounding the eye of a hurricane are called（）.ASpiral rainbandsBCloud wallsCFunnel cloudsDCyclonic spirals
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（）is formed when the droplets or ice crystals in clouds have become sufficiently large to fall to the ground.AHumidityBTemperatureCPrecipitationDWind
单选题Altocumulus clouds are defined as（）.Ahigh cloudsBmiddle cloudsClow cloudsDvertical development clouds
单选题What is the first visible indication of the presence of a tropical cyclone or hurricane（）.AStratocumulus clouds or strange birdsBRain and increasing windsCAn exceptionally long swellDDark clouds and the“bar”of the storm
单选题Cumulus clouds that have undergone vertical development and have become cumulonimbus in form，indicate（）.Aclearing weatherBthat a warm front has passedCprobable thunderstorm activityDan approaching hurricane or typhoon
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The new study published in Science indicates that______.Alow-level clouds tend to warm the ocean.Bmore cloud cover means a warmer world.Cthe warming of ocean is a threat to the low-level clouds.Dthe Pacific Ocean has more low-level clouds than before.
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
单选题We watched the plane（）behind the clouds.AdisappearingBdisappearedCdivingDdived