单选题Rainfall is the main _____ of water supply in that area.AkindBsortCsourceDresource
单选题
Rainfall is the main _____ of water supply in that area.
A
kind
B
sort
C
source
D
resource
参考解析
解析：
句意：在那个地区，降雨是主要的供水来源。source意为“来源”，如Bad food is a source of illness. 意为“坏了的食物是疾病之源。”此题容易误选与C项拼写相近的D项：resource，意为“资源，财力”，如natural resources意为“自然资源”。
句意：在那个地区，降雨是主要的供水来源。source意为“来源”，如Bad food is a source of illness. 意为“坏了的食物是疾病之源。”此题容易误选与C项拼写相近的D项：resource，意为“资源，财力”，如natural resources意为“自然资源”。
相关考题：
13% of those questioned gave bad housing as their main ________ of worry. A.resourceB.aimC.sourceD.origin
EThe need to feed a growing population is putting much pressure on the world’s supply of water. With 97% of the world’s water too salty to be drunk or used in agriculture, the worldwide supply of water needs careful management, especially in agriculture. Although the idea of a water shortage（短缺）seems strange to someone fortunate enough to live in a high rainfull country, many of the world’s agricultural industries experience constant water shortages.Although dams can be built to store water for agricultural use in dry areas and dry seaons, the costs of water redistribution(重新分配)are very high. Notonly is there the cost of the engineering itself, but there is also an environmental cost to be considered. Where valleys(山谷)are flooded to create dams, houses are lost and wildlife homes destroyed. Besides, water many flow easily through pipes to fields,but it cannot be transported from one side of the world to the other. Each country must therefore rely on the management of its own water to supply its farming requirements.This is particularly troubling ro countries with agricultural industries in areas dependent on irrigation（灌溉）. In Texas, farmers’ overuse of irrigation water be resulted in a 25% redcution of the water stores. In the Central Valley area of south eastern USA, a huge water engineering project provided water for farming in dry vallege, but much of the water use has been poorly managed.Saudi Arabia’s attempts to grow wheat in desert areas have been the pumping of huge quantities of irrigation water from underground reserves. Because there is no rainfall in these areas, such reserves can only decrease, and it is believed that fifty years of pumping will see them run dry.72. From the first two paragraphs we learnt that _______.A.much of the world’s water is available for useB.people in high rainfll countries feel luckyC.the costs of water redistribution should be consideredD.water can be easily carried through pipes across the world
The text is mainly about .A.water supply and increasing populationB.water use management and agricultureC.water redistribution and wildlife protectionD.water shornages and environmental protection.
The blowers of an inert gas generation system aboard a tanker，will be automatically secured if ______．A.Normal water supply at the water seal is lostB.The temperature of the inert gas being delivered to the cargo tanks is more than 150℉C.The cooling water supply to the scrubbers is lostD.All of the above
共用题干第一篇Water Resources on the EarthThe second most important constituent（构成成分）of the biosphere（生物圈）is liquid water. This can only exist in a very narrow range of temperatures,since water freezes at 0℃and boils a 100℃．Life as we know it would only be possible on the surface of a planet which had temperature: somewhere within this narrow range.The earth's supply of water probably remains fairly constant in quantity.The total quantity of water is not known very accurately,but it is about enough to cover the surface of the globe to a depth of about two and three-quarter kilometers.Most of it is in the form of the salt water of the oceans一about 97 percent. The rest is fresh.But three-quarters of this is in the form of ice at the poles and or mountains and cannot be used by living systems until melted.Of the remaining fraction,which h somewhat less than one percent of the whole.There is 10—20 times as much stored underground water as there is actually on the surface.There is also a tiny,but extremely important fraction of the water supply which is present as water vapour in the atmosphere.Water vapour in the atmosphere is the channel through which the whole water circulation（循环） of the biosphere has to pass.Water evaporated（蒸发）from the surface of the oceans,from lakes and rivers and from moist（潮湿的）earth is added to it. From it the water comes out again as rain or snow,falling on either the sea or the land. There is,as might be expected, a more intensive evaporation per unit area over the sea and oceans than over the land,but there is more rainfall over the land than over the oceans and the balance is restored by the run off from the land in the form of rivers.There is more of rainfall________.A:over the mountains than over the riversB:over the rivers than over the mountainsC:over the land than over the oceansD:over the oceans than over the land
Which of these represent the main components of Database Resource Manager？（）A、 Resource consumer groupsB、 Resource plansC、 Resource-plan groupsD、 Resource-plan directivesE、 All of the above
单选题The main purpose of starting the diesel engine on air briefly is（）Ato inspect if the cylinder has the water leakageBto expel out the residual water/gas/oil from the cylinderCto check if fuel supply is normalDA and B
单选题One of the reasons that causes oil flowed from sludge outlet of a self-cleaning purifier is （）Aseal water supply be cut offBmake-up water supply be cut offCoil outlet valve closed or not open sufficientlyDthe flow rate of oil is too much
单选题A water pump can not supply water after startingIt may be caused by （）.Aclosed discharge valveBbroken pipe lineCworn shaftDboth A and B
单选题When distilling salt water the cooling water discharging from the distiller is fed back to evaporator as feed water （）.Ato cut down the amount of cooling water neededBto prevent an excess amount of cooling water from being discharged to the bilgesCto supply hot water to the evaporator for more economical operationDNone of the above is tree
单选题After resolving the trouble of main power supply, main switch of emergency generator should（）, if power supply is refreshed.Abe switched off by the duty officerBbe switched on by the duty officerCbe switched off automaticallyDbe switched on automatically
单选题What is the main advantage of a rain barrel system?AIt benefits the Earth by recycling water.BIts efficiency increases in areas with little rainfall.CIt utilizes technology that is centuries old.DIt results in lower utility payments.
单选题Normally，potable water systems are connected directly to the（）.Afire-main systemBfeed-water systemCfreshwater sanitary systemDdomestic water tank
单选题In order to raise the efficiency of the water supply, measures should be taken to _____.Acentralize the management of water resourcesBincrease the sense of responsibility of agencies at all levelsCguarantee full protection of the environmentDencourage local and regional control of water resources
单选题The fuel from the bunker tanks must be treated by before entering the service tanks（）, from where the fuel enters（）Acentrifugal separators; the engine cylinderBoily water separators; the engine cylinderCoily water separators; the fuel supply systemDcentrifuges; the fuel supply system
单选题Oil fires are best extinguished by（）.Acutting off the supply of oxygenBremoving the fuelCcooling below the ignition temperatureDspraying with water
单选题One of the reasons that cause oil flowed from sludge outlet of a self-cleaning separator is（）Aseal water supply be cut offBmake up water supply be cut offCoil outlet valve closed or not open sufficientlyDthe flow rate of oily water is too much
单选题For the proper control of the air temperature in an air conditioning system using chilled water circulation, which of the listed conditions should remain constant regardless of load changes?（）AChilled water system supply temperatureBChilled water system return temperatureCCompressor discharge temperatureDCompressor suction pressure
单选题If separating effect is not good, which measure should be taken （）Aworking at intervals and properly heatingBwarming up to 70℃, increase water supply flowCimproving impulse of water supplyDreducing water supply flow
单选题Where is the cooling water from the compensating tank in the cooling water system of main engine lead to?（）Adischarge side of the centrifugal pumpBsuction side of the centrifugal pumpCthe lowest point of the cooling water systemDinlet of the main engine
单选题If separating effect is not good, we can improve it by （）Aflushing separator with hot waterBincreasing water supply flowCheat oily water properlyDopening manual oil discharge value
单选题The blowers of an inert gas generation system aboard a tanker，will be automatically secured if（）.Anormal water supply at the water seal is lostBthe temperature of the inert gas being delivered to the cargo tanks is more than 150°FCthe cooling water supply to the scrubbers is lostDall of the above
单选题Which of the following conditions may need to be reduced when operating a large, low speed, main propulsion, diesel engine at low loads?（）AInjection pressuresBControl air supply pressureCCooling water flow through after-coolersDLube oil temperature