【Coralreefs(珊瑚礁)arenotjustbeau-查字典问答网
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  【Coralreefs(珊瑚礁)arenotjustbeautifultolookat,butalsoveryuseful.Theyshelternearly25%ofoceanlifeandprovidefoodforbillionsofpeople.Howeverlikemanyotherspecies,thisamazingecosystem(生态系统)isin】

  Coralreefs(珊瑚礁)arenotjustbeautifultolookat,butalsoveryuseful.Theyshelternearly25%ofoceanlifeandprovidefoodforbillionsofpeople.Howeverlikemanyotherspecies,thisamazingecosystem(生态系统)isindangerofdyingout!

  Therearetwomainreasonsforthedestruction—therisingcarbondioxidelevelscausedbyglobalwarmingaswellashumaninfluenceslikebottomoperation.Whilenotmuchcanbedoneabouttheformer,thelosscausedbythelattercanbereduced.

  Bottomoperationinvolvesdroppingnetstotheoceanbedandthendraggingthemupwhenfilledwithfish.Thisactiondamagedtheoceanfloor,causingthecoralbranchestoseparatefromthereefs.Whilethatisverydiscouraging,thegoodnewsisthatifthesebranchesarefoundquickly,theycanbesaved.Atpresent,thatworkisbeingperformedbyvolunteerdivers.Butthemethodhasonlylimitedsuccessbecausetheycannotstaylongunderwaternorreachdepthsofover200meterswheresomeofthedeep-seacoralgrows.

  However,thisisnotthecaseforCoralbots—therobotsthatcanconstantlyseekoutbrokenbranches.Ateamof‘coralbots’,eachindividuallyworkingtosimpleruleswillpiecetogether’damagedbitsofcoralallowingthemtoregrow.Theyareprogrammedtobeabletodistinguishbetweenotherthingsandthecoral.Therobotsworktogetheringroups,similartobees.Ifonecoralbotisdamagedthentheotherswillstillbeabletocompletethetask.

  DrLea-AnneHenrysaid:“Theprojectofusingcoralbotsoffersusthepossibilitytorestore(修复)thefunctionofreefs.Itisinthefinalstageoftesting.OncereadytheresearchershopetobuildhundredsofthemandusethemeffectivelyinthewatersoffScotlandandthenhopefullyintheoceansacrosstheworld.”

  1.Whichofthefollowingisacauseofthedangerthatcoralreefsarefacing?

  A.Theappearanceofnewcreatures.

  B.Theseriouslypollutedseawater.

  C.Theactivitiesofvolunteerdivers.

  D.Humanactivitieslikebottomoperation.

  2.Comparedwithvolunteerdivers,coralbots______________.

  A.canstaylongerunderwater

  B.mustworkasbeesdo

  C.candistinguishwhatiscoral

  D.canneverbedamaged

  3.Whatdoestheunderline

1回答
2020-08-31 08:56
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陈蜜

  1.D2.A3.A4.B本文主要介绍了珊瑚礁所面临的问题以及应对的方法。珊瑚礁由于全球变暖以及人类的一些海底作业而濒临灭绝。对此,Coralbots却是一个挽救珊瑚礁的好帮手,它可以长时间呆在水下以帮助受损的珊瑚...

2020-08-31 09:00:22

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