【阅读理解Weallknowthatbirdsusethei-查字典问答网
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来自孙永香的问题

  【阅读理解Weallknowthatbirdsusetheirfeathers(羽毛)tolinetheirnests.Buthaveyoueverheardofabirdeatingitsownfeathers?Itisabirdwhichlivesinthewateranditiscalledt】

  阅读理解

  Weallknowthatbirdsusetheirfeathers(羽毛)tolinetheirnests.Buthaveyoueverheardofabirdeatingitsownfeathers?Itisabirdwhichlivesinthewateranditiscalledthegrebe.Thegrebe'sfeathersaresilkytotouchandareblackorgrayincolor.Itisusually7to10incheslongandhasshortwingsandapointedbill(鸟嘴).Iteatsitsownfeathersandfeedsthemtotheiryoungonestoo.Anditalwayspreferssoftfeatherswhichitgetsridofthroughouttheyear.

  Scientistsbelievethatitsfeather-eatinghabitislinkedtotheprocessinwhichitthrowswaste.Thegrebehasauniqueexcretorysystem.Itthrowsoutoneortwoballsofwastethroughitsmoutheverytwodays.Themainfoodofgrebeisfish.Sotheballofwastehassomethinghardtodigest(消化)likefishbonesandscales(鱼鳞).Andthereareparasites(寄生虫).Itisimportantforthegrebetothrowtheseparasitesout.Ifitdidn'ttheywouldmakeitsick.Accordingtoscientiststhefeathersaddfibertoitswaste.Itmakesiteasiertoform(形成)theballofwasteandtothrowitout.

  Anotherinterestingcharacteristicisitstoes(脚趾).Theyareunitedtoformawebnearthebasewhiletherestareroundedlikeanumbrella.Theshapeofitstoeshelpsittoswim.Infactthegrebesareexcellentswimmersandtheyusetheirfeetonlyfordivingforceunderwater.

  Thegrebemakesitsnestonfloatingleavesorplantsandlaysabouttwototeneggsinit.Boththemaleandfemalegrebehatch(孵化)theeggsandtakecareoftheyoungones.Theyounggrebeshavestripes(条纹)onthem.

  Thereare18to20speciesofgrebeslivingaroundtheworldsomeofwhichareendangered.

  (1)

  Whatdoweknowaboutthegrebe?

  []A.

  Itsfeathersfeelsmooth.

  B.

  Ithaswingsabout7to10incheslong.

  C.

  Ithasstripesonthebodywhenitgrowsup.

  D.

  Onlythemotherg

1回答
2020-06-13 19:35
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刘立黎

  答案:1.A;2.D;3.D;4.D;5.A;

2020-06-13 19:38:29

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