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来自冷祥贵的问题

  【ThePepperedMothakindofinsectisfoundinEngland.Itislightbrownincolorandlikestosettleontreeswhicharealsolightbrown.Thismakesthemothdifficulttobeseenandbirdsarelesslikelytonoticeandeatit.】

  ThePepperedMothakindofinsectisfoundinEngland.Itislightbrownincolorandlikestosettleontreeswhicharealsolightbrown.Thismakesthemothdifficulttobeseenandbirdsarelesslikelytonoticeandeatit.

  Butwiththedevelopmentofindustrysmokefromfactoriesbegantoreachthetreeswherethemothsettled.Itmadethetreesblacker.Thensomethingverystrangetookplace:inindustrialareasthePepperedMothbegantochangecolor.Itbecamedarkeraswell.Althoughthechangetookseveralyearssomescientistssoonnoticedthatnewly-bornmothswerealittledarkerthanusual.

  AscientistcalledKettleWelldecidedtomakeacarefulstudyofthis.HemarkedsomeofthelightmothsandsomeofthedarkeronesandsetthemfreeinthewoodsnearBirminghamanindustrialcity.Laterheretargetasmanythemarkedmothsaspossible(Theresultwasgiveninthechart).

  KettleWell’sresearchwasdoneintheearly1950s.SoonafterwardsBritainintroducednewlawstoreducesmokeandfactorypollution.

  CanyouimaginewhatwouldhappentothePepperedMothastheairbecamecleaneragain?

  lightmoths

  darkermoths

  Mothssetfree

  201

  601

  Mothsrecaught

  34(16%)

  206(34%)

  1.ThetreeswherethePepperedMothsettledchangedtheircolorbecause_____________________________.

  A.thePepperedMothchangeditscolor

  B.thePepperedMothcouldn’tbeeasilyfoundonthem

  C.industryinEnglanddevelopedquickly

  D.thesmokefromfactoriespollutedthem

  2.ThePepperedMothbegantochangeitscolorinindustrialareasbecause _____________________________.

  A.itchangeditscolorallthetime

  B.itwasfondofthecolorofitslivingplace

  C.ithadtoprotectitselfbydoingso

  D.itwasaspecialsortofinsect

  3.FromtheresultsofKettleWell’sresearchwecanseethat_________________.

  A.manymoreofthelightmothswerekilledoreaten

  B.morethanone-fifthofthelightmothsescapedbeingkilled

  C.threetimesasmanydarkmothswerekeptsafeaslightone

1回答
2020-12-21 23:30
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邱恺

  【小题1】D

  【小题2】C

  【小题3】A

  【小题4】C

  【小题5】A

2020-12-21 23:35:17

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