课时提能练21-22课时提能练(二十一)Book4Unit2Sportsevents课时作业A：基础层面Ⅰ.单句语法填空1．Theyfoundthemselvescompetingwith/againstforeigncompaniesforashareofthemarket.2．WevisitedHuangshanwithalocalmanleading(lead)theway.3．Ihadabadcold，otherwiseIwould_have_visited(visit)youlastweek.4．Onmywayhome，Isawamiddleagedmanlyingbytheroadside，obviouslydrunk(drink)．5．Twofactorieswereclosedinanattemptto_protect(protect)theenvironment.Ⅱ.语境语法填空TheOlympicGames1.are_held(hold)everyfouryears.TheancientOlympicGamesbeganaroundtheyear776BCinGreece.Atthattimetheyoungmencompeted2.inrunning，jumpingand3.wrestling(wrestle)．Butwomenwerenotallowed4.to_take(take)partinthegamesin5.thepast.TheoldOlympicGamesstoppedafterabouttheyearAD394.However，thefirstOlympicGamesinmoderntimes6.happened(happen)intheyear1896.ThatwasaFrenchman，PierredeCoubertin，7.whobroughttheOlympicsbacktolife.HedreamtthattheOlympicswouldmake8.itpossibleforpeopleofallcountriestolivesidebysideinpeace.TheOlympicmottois“Faster，Higher，Stronger”．Itmeansthateveryathleteshouldtrytorunfaster，jumphigher，andthrow9.farther(far)．The2008OlympicGameswereheldinBeijing，anditwasthefirsttimethattheChinese10.athletes(athlete)hadwonthemostgoldmedals.Ⅲ.完成句子1．她的梦想是参加奥运会比赛。Herdreamwasto_compete_intheOlympics.2．汤姆不在期间将由我负责这个班。Iwillbeinchargeoftheclassin_Tom's_absence.3．穿上外套，不然你会感冒的。Putyourcoaton，otherwise_you'll_catch_a_cold.4．迄今为止，研究尚未产生任何具有重大意义的结果。Sofar，theresearchhasn'tproducedanythingof_great_significance.5．让我们感到宽慰的是，那个迷路的小孩十天后返回了家里，疲惫不堪却很健康。Toourrelief，themissingchildreturnedhometendayslater，tired_but_healthy.课时作业B：能力层面Ⅰ.阅读理解A(2019·郑州市第一次质量预测)Ifyou'veeverhadadog，youknowjusthowdeepaconnectionyoucandevelopwith“man'sbestfriend”．Butadog'slifeismuchshorterthanhumans，about12to15yearslong，whichmeanseverydogownerhastogothroughtheheartbreakingmomentwhentheirlovingpetpassesaway.Whynotmakeacloneofthatdogthen?ThisisthesolutionofferedbyaSouthKoreancompany，SooamBiotechResearchFoundation.Thecompanyhasalreadysuccessfullyclonedatleast400dogs，mostlyforUScustomers，eversinceitpioneeredthetechniquein2005.Now，SooamBiotechhasintroduceditsbusinesstoUKdogownersaswell，offeringthemdogsthatlookjustliketheirlostones.Tocloneadog，researchersfirstneedtotakeaskincellfromalivingdogoronethathasjustdied.Meanwhile，anotherdogisselectedtosupplyanegg.ResearchersthenreplacetheDNAintheeggwiththatfromtheskincellandimplanttheeggintothewomb(子宫)ofafemaledog.Theegggrowsintoapuppyoverthefollowingtwomonths.Thewholeprocesstakeslessthanaday，butitcomesatashockinglyhighprice—around￡63,000.Butifyoucan'tafforditnow，youcanalsosavethecellinalaboratoryandaccessitatalaterdate.However，magicalascloningmightsound，thereisnoguaranteethatthecloneddogwillbeaperfectcopyoftheoriginalone.Justlikeidenticaltwinsofhumans，theysharetheexactlysameDNAbuttherewillstillbesmalldifferencesbetweenthem.“ThespotsonaDalmatian(斑点狗)clonewillbedifferent，forexample，”InsungHwang，headofSooamBiotech，toldTheGuardian.Dogownerswillalsohavetoacceptthefactthatpersonalityisnot“cloneable”．Apartfromgenes，personalityisalsodeterminedbyupbringingandenvironment，whicharebothrandomelementsthatcloningtechnologiessimplycannotovercome，ProfessorTomKirkwoodat...
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