阅读理解FarfromthelandofAntarcticaahugeshelfoficemeetstheocean．AttheundersideoftheshelftherelivesasmallfishtheAntarcticcod．Forfortyyearsscientistshave|小学英语问答-字典翻译问答网

问题标题：

阅读理解FarfromthelandofAntarcticaahugeshelfoficemeetstheocean．AttheundersideoftheshelftherelivesasmallfishtheAntarcticcod．Forfortyyearsscientistshave

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．Becauseofitssugarcontent．Itiscalledaglycoprotein．Soithascometobecalledtheantifreezefishglycoprotein．OrAFGP．

Whatisthetextmainlyabout?

[　　]

A．

TheterribleconditionsintheAntarctic．

B．

Aspecialfishlivinginfreezingwaters．

C．

TheiceshelfaroundAntarctica．

D．

ProtectionoftheAntarcticcod．

陶亮回答：

　　答案：1．B;2．C;3．B;4．A;

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