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  • 《極光形成之謎》閱讀附答案

    時間:2018-12-21 11:46:50  來源:第九閱讀網  作者:佚名  影響:

     極光形成之謎

    ①1950年的一個夜晚,北極夜空上方出現淡紅和淡綠色的光弧,時而像在空中舞動的彩帶,時而像在空中燃燒的火焰,時而像選在天邊的巨傘……它輕盈的飄蕩,不斷變化著自己的形狀,持續了幾個小時。她多彩多姿,一會兒紅,一會兒藍,一會兒綠,一會兒紫,變幻莫測。這就是美麗的極光。

    ②極光是太陽風將帶電粒子吹到地球兩極上空,被地磁俘獲產生的一種特殊光學現象。

    ③極光在很多地方出現過,但“極光之源”到底在哪里呢?極光是如何形成的呢?極光現象為什么多出現在南北兩極呢?

    ④科學家研究認為,太陽活動是極光之源。極光出現的頻率與太陽活動有很大關系,極光就像太陽發出的電。太陽是一顆恒星,不斷放出光和熱。其表面和內部進行各種化學元素的核反應,產生出強大的、內含大量帶電粒子的帶電微粒物流。這些帶電微粒射向空間,和地球外80~1200千米高空中的稀薄氣體的分子碰撞時,由于速度快而產生發光現象。太陽活動是周期性的,其周期大約11年。在太陽活動的高潮期,太陽黑子出現的最多,有人發現當一個“大黑子”經過太陽中心的子午線20~40小時候,地球上一定會出現極光。

    ⑤那為什么極光現象多出現在南北兩極呢?原來,地球本身是個近似以南北兩極為地磁兩極的大磁石。太陽送來的粒子流接近地球時,以螺旋形的運動方式飛向兩個磁極。事實上,磁極不能完全控制所有的帶電粒子流,在太陽噴發的帶電粒子流非常強烈的年份,也能在兩極地區以外的一些地方觀察到極光。因為空氣成分非常混雜,不同氣體成分如氧、氮、氦、氖等在帶電微粒流作用下,會發出不同的光,所以極光看上去多彩絢麗。有人從地球磁層的角度考慮,認為地球磁層包裹著地球,就像地球的“保護網”,使之避免遭受到太陽風輻射粒子的侵襲。但在南北極的上空,這張“網”并不結實,有較大的“間隙”,通過“間隙”,部分太陽風便會侵入地球磁層。由于南北極上空有“間隙”,因此極光現象多發生在兩極地區的上空。

    ⑥但是,上述觀點雖較好的解釋了極地地區的極光現象,卻無法解釋近地面附近出現的極光現象。一些人認為這些極光是由于地面附近的靜電放電所產生的。據史料記載,離地面1.2~3.0米都出現過極光。有時人們在出現近地極光的地方,還能聞道臭氧的味道。

    ⑦因為許多極光現象與彗星明亮的尾巴有相似之處,所以有人把極光現象與彗星聯系起來,這對認識極光有一定好處的。盡管極光之謎還沒有完全揭開,但人類對它已經有了較科學的認識,也許很快科學家們就能告訴我們極光真正的奧秘。

    《極光形成之謎》閱讀題及答案

    19.選文第⑴段在文中有什么作用?(3分)

    20.選文第⑵段運用了哪種說明方法?有什么作用?(3分)

    21.請具體分析選文第⑷⑸段順序不能調換的原因。(3分)

    22.選文第⑹段的加點詞語“據史料記載”是如何體現說明文語言特點的。(3分)

    23.選出下列有內容與選文不符的一項()(3分)

    A.極光看上去絢麗多彩,是因為空氣中含有氧、氮、氦、氖等不同氣體成分在帶電粒子流作用下,發出了不同的光。

    B.極光現象多出現在南北兩極,但在太陽噴發的帶電粒子流非常強烈的年份,兩極地區以外的一些地方也能觀察到極光。

    C.太陽活動是周期性的,其周期為11年。在太陽活動的高潮期,太陽黑子出現得最多。

    D.極光形成之謎至今還沒有完全揭開,啟示我們科學探索之路是永無止境的。

    19.描寫了地球北極神奇而絢麗的極光現象,1分,引出說明對象“極光”, 1分,語言生活,激發讀者的閱讀興趣。1分,計3分。

    20.下定義,1分,科學準確嚴密地揭示了極光的本質特征。2分,計3分。

    21.第⑷段寫太陽活動是極光之源及極光形成的原因,1分,第⑸段寫極光多出現在南北兩極的原因;1分,第⑷⑸段的內容分別與第⑶段內容一一照應,結構嚴謹,所以不能調換。1分,計3分。

    22.“據史料記載”表明下文的內容有科學依據,起到限制的作用,1分,說明離地面1.2-3.0米出現過極光的現象是有科學依據的,不是主觀臆造的,1分,“據史料記載”體現了說明文語言的準確、嚴密特點。1分,計3分。

    23.C.計3分。

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