2017年高中英语选修八（人教版）练习：第二单元过关检测

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1、第二单元过关检测（时间:90分钟满分:120分）I.阅读理解（共12小题;每小题2.5分，满分30分）阅读下列短文，从每题所给的四个选项（A、B、C、D）中，选出最佳选项。AC一）导学号53080020AteamofMichiganStateUniversity（MSU）researchershasdevelopedanew,moreefficientwayofcloningzebrafish9abreakthroughthatcouldhaveanimpactonresearchintohumanhealth.Zebrafisha

2、requicklybecomingtheanimalofchoiceformanyresearchers."Aftermicejheyarethemostcommonlyusedvertebrates9thatis,animalswithbackbones,ingeneticstudics/^saysJoseCibclli.thcleaderoftheteam."Theyarcusedincancerandheart-diseaseresearchbecausetheyhavemanyofthesamegenesaspeopleha

3、ve：Formorethan20years,zebrafishhavealsoservedasanexcellentmodelforunderstandingbothnormaldevelopmentandbirthimperfections.Morerecently,researchwithzebrafishhasextendedtomodelinghumandiseases・Traditionalcloningusesaneggandadonor（扌目赠者）ccll.ThcDNAisremovedfromtheeggandrep

4、lacedbytheDNAtakenfromthedonoi;Theresultingfishisanexactgeneticcopyofthedono匚InCibelli,stechnique,theeggisremovedfromthefemalezebrafishandplacedintheovarian（卵巢白勺）fluidofaChinooksalmon,anotherkindoffish,beforethedonorcellisplacedintotheegg.Thepreviousmethodsofcloningzeb

5、rafishhadverylowsurvivalrates.Withthenewtechnique,thenumberofclonedfishisincreasedby15percent.Whatmakeszebrafishsousefulinresearchisthattheireggsaretransparent（透明白勺），makingthefish，sdevelopmenteasytofollow.Improvingzebrafishcloningtechniquesisalsoimportantbecausecurrent

6、lythemouseistheonlygoodmodelforgeneticresearch."Sofarthemouseistheonlyanimalfromwhichyoucandeletegenesinareliableway/Cibellisays.uWhatresearchersdoistomutate（使变异）agene,destroyitsfunctioncompletely,andthenstudytheconsequence.^1.Whatdowelearnaboutzebrafishfromthetext?A.T

7、heycanbeusedtocurehumandiseases.B.Thcyhavebeenusedingeneticstudiesfor20years.C.Theyaretheonlyvertebratesusedincloning・D.Theirsurvivalratesareincreasedbythenewmethodofcloning.详细分析：推理判断题。根据第五段最后的"...thenumberofclonedfishisincreasedby15percent.^^可以知道,这种新的克隆技术可以大大提高克隆斑马鱼的成

8、活率;根据第四段的“Formorethan20years,zebrafishhavealsoservedasanexcellentmodelforunderstandingbothnormaldevelopmentandbirthim