锅筒水位太低不利于水循环的安全，因此水位越高越好。
1、正确错误
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Britainhas,forcenturies,beenslowlytiltingwith________.
翻译：ChinamaywellbethefavoritewhippingboyofmanufacturersintheUnitedStatesthesedays.Butinthedevelopingworld,thecountryisbecomingthetradingpartnerofchoice,drawinginairplanesfromBrazil,soybeansfromArgentinaandseafoodfromMalaysia,boostingeconomiesandleadingtonewpoliticalalliances.Thegrowingappetiteoftheworld’mostspopulousnationhasmadeChinaanewsourceofincomeforthedevelopingeconomiesofSouthAmericaandAsia.“China’sboomingimportsfromdevelopingcountriesespeciallyofcommodities——arenotonlyhelpinggrowthincountriesfromBraziltoAfrica,butarealreadyreshapinginternationaltraderelations,”saidKennethRogoff,aneconomicsprofessoratHarvardUniversity.DevelopedcountriesalsoaresendingmoregoodstoChins,theworld-largesteconomy,withanestimated’ssixth$1.334trilliongrossdomesticproductin2003,accordingtotheIMF.
Towriteuphisnovel,Johnislookingforanenvironmentfree________outsidedistraction.
ThefunctionsofinstitutionsofhighereducationintheU.S.are________.
Robotsdifferfromautomaticmachines________aftercompletionofonespecifictask，theycanbereprogrammedbyacomputertodoanotherone.
