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下列有关生物实验所涉及的仪器、试剂及技术的说法正确的是

①脂肪的鉴定②噬菌体侵染细菌实验③证明DNA半保留复制

④光合色素提取和分离⑤有丝分裂的观察实验⑥DNA的粗提取与鉴定

A、①②⑤均需使用光学显微镜
B、④⑥均需使用无水乙醇
C、②③均需使用离心技术
D、②③⑤均需使用同位素标记法
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IsTomatschooltoday?No,He’sathome______hehasabadcold.

Thetouristtradeisbooming.Withallthiscomingandgoing,you'dexpectgreaterunderstandingodevelopbetweenthenationsoftheworld.Notabitofit!Superbsystemsofcommunicationbyair,seaandlandmakeitpossibleforustovisiteachother'scountriesatamoderatecost.Whatwasoncethe'grandtour',reservedforonlytheveryrich,isnowwithineverybody'sgrasp?

Thepackagetourandcharteredflightsarenottobesneeredat.Moderntravelersenjoyalevelofcomfortwhichthelordsandladiesongrandtoursintheolddayscouldn'thavedreamedof.Butwhat'sthesenseofthismassexchangeofpopulationsifthenationsoftheworldremainbasicallyignorantofeachother?

Manytouristorganizationsaredirectlyresponsibleforthisstateofaffairs.Theydeliberatelysetouttoprotecttheirclientsfromtoomuchcontactwiththelocalpopulation.Themoderntouristleadsacosseted,shelteredlife.Helivesatinternationalhotels,whereheeatshisinternationalfoodandsipshisinternationaldrinkwhilehegazesatthenativesfromadistance.Conductedtourstoplacesofinterestarecarefullycensored.Thetouristisallowedtoseeonlywhattheorganizerswanthimtoseeandnomore.Astrictschedulemakesitimpossibleforthetouristtowanderoffonhisown;andanyway,languageisalwaysabarrier,soheisonlytoohappytobeprotectedinthisway.Atitsveryworst,thisleadstoanewandhideouskindofcolonization.

Thesummerquartersoftheinhabitantsoftheciteuniversitaire:aretemporarilyreestablishedontheislandofCorfu.BlackpoolisrecreatedatTorremolinoswherethetravelergoesnottoeatpaella,butfishandchips.Thesadthingaboutthissituationisthatitleadstothepersistenceofnationalstereotypes.Wedon'tseethepeopleofothernationsastheyreallyare,butaswehavebeenbroughtuptobelievetheyare.Youcantestthisforyourself.Takefivenationalities,say,French,German,English,AmericanandItalian.Nowinyourmind,matchthemwiththesefiveadjectives:musical,amorous,cold,pedantic,native.Farfromprovidinguswithanyinsightintothenationalcharacteristicsofthepeoplesjustmentioned,theseadjectivesactuallyactasbarriers.Sowhenyousetoutonyourtravels,theonlycharacteristicsyounoticearethosewhichconfirmyourpreconceptions.Youcomeawaywiththehighlyunoriginalandinaccurateimpressionthat,say,'Anglo-Saxonsarehypocrites'ofthat'Latinpeoplesshoutalot'.Youonlyhavetomakeafewforeignfriendstounderstandhowabsurdandharmfulnationalstereotypesare.Buthowcanyoumakeforeignfriendswhenthetouristtradedoesitsbesttopreventyou?Carriedtoanextreme,stereotypescanbepositivelydangerous.Wildgeneralizationsstirupracialhatredandblindustothebasicfact〞howtriteitsounds!每Thatallpeoplearehuman.Weareallsimilartoeachotherandatthesametimeallunique.

1.Thebesttitleforthispassageis

[A]Tourismcontributesnothingtoincreasingunderstandingbetweennations.

[B]Tourismistiresome.

[C]Conductedtourisdull.

[D]Tourismreallydoessomethingtoone'scountry.

2.Whatistheauthor'sattitudetowardtourism?

[A]apprehensive.[B]negative.[C]critical.[D]appreciative.

3.WhichwordinthefollowingisthebesttosummarizeLatinpeopleshoutalot?

[A]silent.[B]noisy.[C]lively.[D]active.

4.Thepurposeoftheauthor'scriticismistopointout

[A]conductedtourisdisappointing.

[B]thewayoftouringshouldbechanged.

[C]whentraveling,younoticecharacteristicswhichconfirmpreconception.

[D]nationalstereotypesshouldbechanged.

5.Whatis'grandtour'now?

[A]moderatecost.

[B]localsight-seeingisinvestigatedbythetouristorganization.

[C]peopleenjoythefirst-ratecomforts.

[D]everybodycanenjoythe'grandtour'

Marytiptoedoverandtooktheclockawaybecauseshehatedtohearit___whenshewastryingtogotosleep.

Ibelievethatremark____fromwhatyousaidyesterday.

___willMr.Forbesbeabletoregaincontrolofthecompany.

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