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【阅读理解FarfromthelandofAntarcticaahugeshelfoficemeetstheocean.AttheundersideoftheshelftherelivesasmallfishtheAntarcticcod.Forfortyyearsscientistshave】
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问题描述:

(1)

(2)

阅读理解

  FarfromthelandofAntarcticaahugeshelfoficemeetstheocean.AttheundersideoftheshelftherelivesasmallfishtheAntarcticcod.

  Forfortyyearsscientistshavebeencuriousaboutthatfish.Howdoesitlivewheremostfishwouldfreezetodeath?Itmusthavesomesecret.TheAntarcticisnotacomfortableplacetoworkandresearchhasbeenslow.Nowitseemswehaveananswer.

  Researchwasbegunbycuttingholesintheiceandcatchingthefish.Scientistsstudiedthefish'sbloodandmeasureditsfreezingpoint.

  Thefishweretakenfromseawaterthathadatemperatureof-1.88℃andmanytinypiecesoficefloatinginit.Thebloodofthefishdidnotbegintofreezeuntilitstemperaturewasloweredto-2.05℃.Thatsmalldifferenceisenoughforthefishtoliveatthefreezingtemperatureoftheice-saltmixture.

  Thescientists'nextresearchjobwasclear:Findoutwhatinthefish'sbloodkeptitfromfreezing.Theirsearchledtosomereallystrangethingmadeupofaprotein(蛋白质)neverbeforeseeninthebloodofafish.Whenitwasremovedthebloodfrozeatseawatertemperature.Whenitwasputbackthebloodagainhaditsantifreezequalityandaloweredfreezingpoint.

  Studyshowedthatitisanunusualkindofprotein.Ithasmanysmallsugarmolecules(分子)heldinspecialpositionswithineachbigproteinmolecule.Becauseofitssugarcontentitiscalledaglycoprotein.Soithascometobecalledtheantifreezefishglycoprotein,orAFGP.

Whatisthetextmainlyabout?

[  ]

A.

TheterribleconditionsintheAntarctic.

B.

Aspecialfishlivinginfreezingwaters.

C.

TheiceshelfaroundAntarctica.

D.

ProtectionoftheAntarcticcod.

林其骏回答:
  答案:1.B;2.C;3.B;4.A;
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