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  • 《鼻孔里的抗菌英雄》閱讀附答案

    時間:2018-12-21 11:49:37  來源:第九閱讀網  作者:佚名  影響:

    鼻孔里的抗菌英雄原文

    ①抗生素療法的未來也許就藏在我們的鼻屎里——這是德國研究人員在《自然》雜志上發表的學術研究論文得出的結論。

    ② 該研究發現了一種由細菌產生的化學分子,能夠消滅對甲氧苯青霉素(青霉素家族的一員)有耐藥性的金黃色葡萄球菌。每10個人中就有一個人的鼻屎里存有這種細菌。

    ③ 金黃色葡萄球菌存在于30%的人的鼻子中,至于另外70%的人如何僥幸逃過該細菌的侵占目前還不得而知。不過鼻子里的其他的細菌,特別是葡萄球菌家族細菌的存在,與金黃色葡萄球菌的存在是負關聯的。金黃色葡萄球菌的存在一般而言是無害的,但是,它一旦進入血液循環,就可能引起后果相當嚴重的感染和炎癥。

    ④ 德國圖賓根大學感染生物學專家安德烈亞斯•佩舍爾的團隊,以人類鼻子里的金黃色葡萄球菌為研究對象。“要想更好地了解一種細菌,必須先了解它的生存方式。”安德烈亞斯•佩舍爾解釋說。為此,他的研究團隊分析了人類鼻子里發現的90種葡萄球菌菌株。其中一種名為“路鄧葡萄球菌”的菌株,存在于約1/10的人的鼻孔里,該菌株成功地“清理”掉了試管培育的金黃色葡萄球菌的菌落。

    ⑤ 在進行了對“路鄧葡萄球菌”的基因操作后,研究人員找出了造成此次抗生行為的英雄:一種被他們命名為“路鄧素”的細菌產生的肽。把這種肽與金黃色葡萄球菌一起放進實驗試管30天,金黃色葡萄球菌便無法繁殖,而且沒有出現其他任何形式的抗生細菌。

    ⑥ 接下來,研究人員用“路鄧素”治療感染了金黃色葡萄球菌的小白鼠,發現“路鄧素”能夠有效消滅對抗生素有耐藥性的腸球菌屬。隨后,研究人員檢查了187名住院病人的鼻子,發現只有5.9%的病人鼻子中同時存有金黃色葡萄球菌和“路鄧葡萄球菌”,34.7%的病人鼻子里有金黃色葡萄球菌而沒有路鄧葡萄球菌。也就是說,當患者鼻腔內有路鄧葡萄球菌時,其鼻腔內同時存在金黃色葡萄球菌的比率僅為鼻腔內沒有路鄧葡萄球菌患者的六分之一。

    ⑦ “使用‘路鄧素’或者能產生‘路鄧素’的葡萄球菌,或許可以成為一

    種預防金黃色葡萄球菌繁殖以及降低病人大面積感染的風險的可行策略。”研究人員建議說。

    ⑧ “這也許看起來很讓人吃驚——人體內的微生物,占據我們身體的細菌,竟然會產生抗生素”,波士頓大學生物學家金•路易斯和菲利普•斯特朗德維茲在共同署名發表的學術論文中寫道,“然而,微生物有一千多個種類,它們中的大部分都需要為自己的生存空間和食物進行抗爭。它們面對著巨大的生存選擇的壓力,而消滅自己的鄰居就是這種生存選擇壓力下的結果。”

    ⑨ 我們的腸道中、皮膚上、鼻孔里,隨處都有細菌安營扎寨。為了生存,它們時刻打磨著自己的武器,而人類的身體遲早會成為這些抵制抗生素的細菌的新戰場。

    《鼻孔里的抗菌英雄》閱讀題

    16、鼻孔里的抗菌英雄是什么?(2分)

    17、文中第⑥段劃線句運用了什么說明方法?有什么作用?(3分)

    18、 第⑦段中的加點詞語“或許”能否去掉?為什么?(3分)

    使用‘路鄧素’或者能產生‘路鄧素’的葡萄球菌,或許可以成為一種預防金黃色葡萄球菌, 繁殖以及降低病人大面積感染的風險的可行策略。

    19、 下列說法與原文不一致的一項是 ( )(2分)

    A 抗生素療法的未來也許就藏在我們的鼻屎里。

    B 維生素有一千多個種類,它們中的大部分都不需要為自己的生存空間和食物進行斗爭。

    C 要想更好地了解一種細菌,必須先了解它的生存方式。

    D 我們的腸道中、皮膚上、鼻孔里,隨處都有細菌安營扎寨。

    《鼻孔里的抗菌英雄》閱讀參考答案

    16、一種被他們命名為“路鄧素”的細菌產生的肽。(2分)

    17、列數字,準確地說明了“路鄧素”能夠有效消滅對抗生素有耐藥性的腸球菌屬。(評分:本題3分,說明方法1分,作用2分)

    18、不能去掉。“或許”表明這種策略不一定可行,現在只是一種研究方向。這體現了說明文語言的準確性。(評分:本題3分,觀點1分,原因2分)

    19、B(2分)

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