sharks have lived in the world’s oceans for millions of years阅读理解答案.

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1、Sharkshavelivedintheworld’soceansformillionsofyears阅读理解答案.　　Sharkshavelivedintheworld’soceansformillionsofyears.Asharkhasanextremelygoodsenseofsmell.Itcanfindsmallamountsofsubstancesinthewater,suchasblood,bodyliquidsandchemicalsproducedbyanimals.Thesepowerfulsenseshelpthemfindtheirfood.11.　　Sha

2、rksgrowslowly.Aboutfortypercentofthedifferentkindsofsharkslayeggs.12._____Somesharkscarrytheiryounginsidetheirbodiesashumansdo.Somesharksarenotabletoreproduceuntiltheyaretwentyyearsold.Mostreproduceonlyeverytwoyears.Andtheygivebirthtofewerthantenyoungsharks.Forthisreason,over-fishingofsharksiso

3、fspecialdangertothefutureoftheanimal.　　13.______.Theyeatinjuredanddiseasedfish.Theirhuntingactivitiesmeanthatthenumbersofotherfishintheoceandonotbecometoogreat.Thisprotectstheplantsandotherformsoflifethatexistintheoceans.　　Peoplehuntsharksforsport,food,medicineandtheirskin.Expertssaytheinternat

4、ionalmarketforsomekindsofsharkshasincreasedgreatlybecausemanypartsofasharkarevaluable.14._______.SharkliveroilisapopularsourceofVitamin.Theskinofasharkcanbeusedlikeleather.InAsia,peopleenjoyakindofsoupmadefromsharkfins.Expertssayafishermancanearnalotofmoneyforevenonekilogramofsharkfins.　　Sharks

5、areamongtheoldestanimalsonEarth.15.____Iftoomanysharksinoneareaarekilled,thegroupofsharkmayneverreturntonormalpopulationlevels　　A.Theothersgivebirthtoliveyoung.　　B.Sharksareimportantforthehealthoftheworld’soceans.　　C.Thisisathreattootherformoflifeintheocean.　　D.Collectorspaythousandsofdollarsfo

6、rthejawsofashark.　　E.Sharksarevaluabletousandwecanmakefulluseofthem.　　F.ButsomesharksareindangerofdisappearingfromEarth.　　G.Sharkseatfish,othersharks,andplantsthatliveintheocean　　11．G　　12．A　　13．B　　14．D　　15．F