It has been demonstrated that rats will, when given a choice over a period of time, prefer water with vitamins to water without

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问题 It has been demonstrated that rats will, when given a choice over a period of time, prefer water with vitamins to water without vitamins even though there is no difference in taste or smell between the two water bottles.

选项

答案有证据表明，在一段时间内，如果让老鼠去挑选的话，它们会选择含有维生素的水瓶，即使两瓶中的水在味道上并无差异。

解析

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成人本科学位英语

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It has been demonstrated that rats will, when given a choice over a period of time, prefer water with vitamins to water without

成人本科学位英语

InancientGreeceathleticfestivalswereveryimportantandhadstrongreligiousassociations.TheOlympianathleticfestivalh

Woman:Iamtryingtofindouthowthisdishwasherworks.ThemanualisinFrench.Ican’twaitforBilltotranslateitforme.

Atpresentalargenumberofpeople______theworstdangerfromautomobilesisaccidentsandnotpollution.

Smallplaneshaveonedistinctdifferencefrom______vehicles:theydonotneedtohaveanythingbuiltonthegroundbeforethe

Millionsoffarmers,drawnbythe______ofemployment,cameintothecitywhichmadetheproblemsoftransportationandhousinge

WhenItrytounderstand______thatpreventssomanyAmericansfrombeingashappyasonemightexpect,itseemstomethatthere

Thepolicediscoveredthethief’shide-outtwodayslater,______,however,thethieveshaddisappeared.

ManhasbecomemasteroftheEarth’ssurface.Heisconstantlyprobingintotheearth’sdepthsandintoatmosphere’supperreach

Withunemploymentrisingandhousingcostsstillhigh,citiesaroundthecountryareexperiencinganewandsuddenwaveofhomel

OnesillyquestionIsimplycannottolerateis"Howdoyoufeel?"Usuallythequestionisaskedofamaninaction—amanwalking

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设f(x，y)二阶连续可偏导，g(x，y)=f(exy，x2+y2)，且f(x，y)=1一x一y+证明：g(x，y)在(0，0)处取极值，并判断是极大值还是极小值，求极值．

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