单选题The erosion of the white cliffs in the south of England _____.Awill soon become a problem for people living in central EnglandBhas now become a threat to the local residentsCis quickly changing the map of EnglandDcan be stopped if proper measures are taken
单选题
The erosion of the white cliffs in the south of England _____.
A
will soon become a problem for people living in central England
B
has now become a threat to the local residents
C
is quickly changing the map of England
D
can be stopped if proper measures are taken
参考解析
解析：
细节题。B项“这种海水侵蚀已经构成了对当地居民的威胁”与文意相符。
细节题。B项“这种海水侵蚀已经构成了对当地居民的威胁”与文意相符。
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材料：Spark erosion is caused by a voltage discharge between the main bearing and journal surface. The cause of the potential is the development of a galvanic element between the ship’s hull, sea water, and the propeller shaft/crankshaft.The oil film acts as a dielectric. The puncture voltage in the bearing depends on the thickness of the oil film. With increasing engine ratings, the specific load in the main bearing is increased. his will reduce the oil film thickness, and enable the discharge to take place at a lower voltage level.Since the hydrodynamic oil film thickness varies through a rotation cycle, the discharge will take place at roughly the same instant during each rotation cycle, i.e. when the film thickness is at its minimum. The roughening will accordingly be concentrated in certain areas on the journal surface. In the early stages, the roughened areas can resemble pitting erosion. but later, as the roughness increases, the small craters will scrape off and pick up white metal-hence the silvery white appearance.Therefore, to ensure protection against spark erosion, the potential level must be kept at maximum 80 mV, which is feasible today with a high efficiency earthing device. If an earthing device is installed, its effectiveness must be checked regularly. Spark erosion is only observed in main bearings and main bearing journals.问题：According to the paragraph one, a voltage between the main bearing and journal surface is produced by______.A.propeller rotationB.leakage from M/E electric control unitC.a galvanic elementD.friction between the main bearing and journal surface______engine ratings increase, the hydrodynamic oil film between the main bearing and journal surface is______.A.The lower/thinnerB.The higher/the thickerC.The lower/thickerD.The higher/thinnerWhen will the spark erosion take place on the journal surface during each rotation cycle?A.when the film thickness is at its minimumB.when the film thickness is at its maximumC.when the engine is on its compression strokeD.when the engine is on its exhaust strokeDuring the engine room watch keeping, which equipment must be noted to ensure protection against spark erosion?A.the antifouling plantB.the earthing deviceC.the main engine electric heating coilsD.the shaft generator请帮忙给出每个问题的正确答案和分析，谢谢！
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Text 2 When people talk about a"north-south divide"in Britain they are usually referring to house prices,employment and the ratio of private-sector to public-sector jobs.The south scores higher on all such measures.But new data from the British Trust for Ornithology（BTO）,a research charity,hints at the growth of another north-south divide-this time to the north's benefit.Every 20 years the BTO produces a superbly detailed atlas of bird life in Britain and Ireland.The 2007 t0 2011 edition is cheery:more species are tallied than in previous atlases,and many birds are increasing in number.Compared with two decades ago,45%of regular native species are ranging more widely while 32%are living in smaller areas;the rest have stayed put.But the most striking news comes from the north.The overall populations of woodland,farmland and migrant perching birds are up in northern England and Scotland but down in the south.The same is true of individual species such as the garden warbler,bullfinch and swallow.The number of cuckoos,a closely-watched species,declined by 63%in England between 1995 and 2010 but by only 5%in Scotland.Raptors are faring especially well in the south,but their numbers are rising in most parts of Britain.Partly this reflects climate change,suggests Simon Gillings of the BTO.Some birds are drawn to warmer winters in Scotland and northem England;visiting migrants may stick around for longer.Hard though it may be to believe during a week of torrential rain,the south is becoming drier,pushing snipe northward.More efficient farming has squeezed some farmland species.Some birds find it harder to make homes in the south,too.Pressure on housing means dilapidated buildings and barns,handy for nesting,have been converted into human dwellings.Between 2006 and 2012 the number of vacant dwellings fell by 17%in London and by 12%in Kent.Over the same period the number of empty houses increased by 16%in Derbyshire and by 10%in Lancashire:Northern mining villages once full of workers are now sparsely populated,points out Ian Bartlett,a birdwatcher in Hartlepool,in north-east England.They have become hot spots for birds and the people who watch them.Culrural difference also plays a part,thinks Mark Cocker,an expert on birds.The"obsession with tidiness"is stronger in the south,he says.Fewer people cultivate gardens;they prefer to cover them in decking and remove weeds from between concrete slabs.Village greens are mowed short.In contrast,Scotland and northern England have more trees,grassland and wind-swept moors.Less popular with humans,rugged parts of the countryside are filling up with a winged population instead.The text mainly discusses_____A.birds thriving in EnglandB.new north-south divideC.culture difference between north and southD.climate change in England
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Text 2 When people talk about a"north-south divide"in Britain they are usually referring to house prices,employment and the ratio of private-sector to public-sector jobs.The south scores higher on all such measures.But new data from the British Trust for Ornithology（BTO）,a research charity,hints at the growth of another north-south divide-this time to the north's benefit.Every 20 years the BTO produces a superbly detailed atlas of bird life in Britain and Ireland.The 2007 t0 2011 edition is cheery:more species are tallied than in previous atlases,and many birds are increasing in number.Compared with two decades ago,45%of regular native species are ranging more widely while 32%are living in smaller areas;the rest have stayed put.But the most striking news comes from the north.The overall populations of woodland,farmland and migrant perching birds are up in northern England and Scotland but down in the south.The same is true of individual species such as the garden warbler,bullfinch and swallow.The number of cuckoos,a closely-watched species,declined by 63%in England between 1995 and 2010 but by only 5%in Scotland.Raptors are faring especially well in the south,but their numbers are rising in most parts of Britain.Partly this reflects climate change,suggests Simon Gillings of the BTO.Some birds are drawn to warmer winters in Scotland and northem England;visiting migrants may stick around for longer.Hard though it may be to believe during a week of torrential rain,the south is becoming drier,pushing snipe northward.More efficient farming has squeezed some farmland species.Some birds find it harder to make homes in the south,too.Pressure on housing means dilapidated buildings and barns,handy for nesting,have been converted into human dwellings.Between 2006 and 2012 the number of vacant dwellings fell by 17%in London and by 12%in Kent.Over the same period the number of empty houses increased by 16%in Derbyshire and by 10%in Lancashire:Northern mining villages once full of workers are now sparsely populated,points out Ian Bartlett,a birdwatcher in Hartlepool,in north-east England.They have become hot spots for birds and the people who watch them.Culrural difference also plays a part,thinks Mark Cocker,an expert on birds.The"obsession with tidiness"is stronger in the south,he says.Fewer people cultivate gardens;they prefer to cover them in decking and remove weeds from between concrete slabs.Village greens are mowed short.In contrast,Scotland and northern England have more trees,grassland and wind-swept moors.Less popular with humans,rugged parts of the countryside are filling up with a winged population instead.According to the text,more species are found in the north Britain,because____A.climate change plays a major roleB.some birds enjoy making home in the forestC.there is little space for birds in the southD.many distinctive birds are killed in the south
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