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...