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  3. 學習啦>學習方法>各學科學習方法>閱讀答案>《大腦也要每天洗澡閱讀題答案》正文

    大腦也要每天洗澡閱讀題答案

    時間:2016-07-05 14:14:06本文內容及圖片來源于讀者投稿,如有侵權請聯系xuexila888@qq.com 淑航 我要投稿

      通過閱讀 《大腦也要每天洗澡》這篇文章,你會明白一些道理。下面是學習啦小編收集整理的《大腦也要每天洗澡》的閱讀題目及其參考答案以供大家學習。
     

      《大腦也要每天洗澡》閱讀原文:

     、傧茨標⒀缿撌谴蠡锩刻毂仨氁龅氖虑,畢竟誰也不愿意蓬頭垢面,臟兮兮的。如今,隨著生活條件越來越好,很多人也都會每天洗澡,讓全身清清爽爽。但是,你知道嗎?我們的大腦也需要每天洗澡。

     、诋斎,這給大腦洗澡并不是沖洗下頭部,或者把大腦劈開,沖洗下。從科學的角度來說,我們人類腦中的神經細胞會產生β-淀粉樣蛋白和tau蛋白等代謝產物,這些蛋白如果在腦中沉淀聚集,就會產生很強的神經毒性,足已殺死腦細胞。臭名昭著的阿爾茨海默病,也就是“老年癡呆癥”就跟這些有害物質的聚集有關。對于大腦而言,這些代謝產物如同污穢又危險的垃圾,必須及時清理。

     、畚覀兊娜梭w內部是有自潔系統的。伴行在動靜脈身邊的淋巴管,負責“清潔”。在美容界廣為傳頌的“淋巴排毒”,其實就是通過加強淋巴管液的流動,促進細胞新陳代謝廢物的排出。然而,腦內并沒有淋巴管這樣的結構,那么,腦細胞產生的垃圾該怎么辦呢?

     、懿挥脫。作為智慧的源泉,大腦不但有辦法洗澡,更有專屬的“洗浴中心”――“Glymphatic”系統。其中,Lymphatic指的是淋巴,說的是腦內這套系統運作的方式有點像外周淋巴系統;而這個“G”字指的是Glia,腦內一類叫膠質細胞的細胞群。它們能表達一種叫水通道的蛋白,這種蛋白就是腦內洗浴中心的總閥。當總閥打開時,洗浴中心的水開始循環,就會把腦細胞產生的有害物質“洗”掉。

     、菔聦嵣,大腦“洗澡”用的水也不一般:大腦的腦室會源源不斷地生產出一種叫腦脊液的液體,沿著腦室與腦室間的孔道不斷輸送,再運行到大腦表面。隨后,腦脊液會沿著大腦表面動脈的間隙一直流入腦內的組織。期間,腦脊液與腦內細胞間液不停地交換,將由細胞產生并排到細胞間隙的“垃圾”帶至腦靜脈周隙,最后排出至腦外,完成一次“洗浴”。如此看來,大腦來一次大清洗還真是件費工夫的事,也更是耗時的事。要知道,大腦洗一次澡大概需要8小時之久。

     、8小時……是不是想起了什么?沒錯兒,大腦就是在你歇著的時候洗澡的!犊茖W》雜志上的一篇研究表明:人腦在睡覺時,腦細胞之間的間隙增大,腦脊液在腦細胞間的循環比醒著時加快很多,幫助大腦排出清醒時產生的垃圾。所以,你不睡覺,大腦就沒法好好洗澡。你要是困了,極有可能是腦內細胞產生的垃圾多了,大腦為了洗澡而逼迫你困倦然后休息。

     、甙疽箤ΜF代人來說算得上是家常便飯。不過,為了身心的健康,更為了腦子好使點,還是每天按時洗洗睡吧,也讓大腦好好清理下。

      《大腦也要每天洗澡》閱讀題目:

      1.選文開頭有何特點?這樣開頭有什么好處?

      2.選文第②段中加線句運用了什么說明方法?有什么作用?

      3.美容界流行的“淋巴排毒”有科學道理嗎?為什么?

      4.28歲的小張喜歡熬夜,每天僅僅睡4個小時,請你用本文的原理來勸一勸小張。

      《大腦也要每天洗澡》閱讀答案

      1.用洗臉刷牙這些大家司空見慣的事情引出說明對象“大腦要每天洗澡”,這樣寫顯得自然得體,不突兀。

      2.運用打比方的說明方法,生動具體地說明了大腦代謝物須及時清理的必要性。

      3.有。我們的人體內部的自潔系統中,伴行在動靜脈身邊的淋巴管,負責“清潔”。“淋巴排毒”,就是通過加強淋巴管液的流動,促進細胞新陳代謝廢物的排出。

      4.小張你好!大腦需要在人休息的時候洗澡,以排出腦內的垃圾。你睡眠時間少,大腦就沒法好好洗澡。為了身心的健康,更為了腦子好使點,還是每天按時睡吧!

      《網絡正在改變我們的大腦》閱讀原文:

      楊凡

     、偃祟惖拇竽X是高塑性的,神經元和突觸會隨著環境的變化而變化。當我們依賴電腦作為理性世界的媒介時,大腦就會受到迅速而明顯的影響。

     、谀X科專家斯茅與他的研究團隊曾做過一個實驗:讓12名互聯網老用戶和12名互聯網新手開始使用谷歌,同時對他們進行了大腦掃描。結果顯示,兩組研究對象大腦之間的顯著區別在于大腦皮層一片被稱為背側前額葉皮質的區域,它的功能是處理短期記憶和決策制定,新手的掃描結果顯示這片區域活動微弱,而老手的則非;钴S。

     、鬯姑┮12名互聯網新手在以后的5天每天使用互聯網。第6天,他們重新掃描了各組的大腦兩組大腦掃描圖片顯示,代表大腦活躍程度的亮斑圖案幾乎一模一樣?梢,僅通過5天的訓練,互聯網新手大腦皮層前部的神經回路就被激活了。

     、軐嶒炞C明:從事某個特定活動的頻率越高,神經通路負責執行這項活動的能力就越強。如果反復刺激同一區域,那個區域的神經回路將變得興奮。后來的實驗也證明:如果你忽略其他區域,其他神經回路將會相應變得衰弱。由此科學家認為,互聯網已經改變人類思維方式,降低大腦集中精力的能力和深度思考的頻率。

     、蓍喿x并非人類與生俱來的能力,人們需要通過學習掌握這種能力。網上閱讀從根本上改變了人類使用大腦的方式,以快餐式、跳躍性、碎片化為特征的“淺閱讀”正成為一種閱讀新趨勢。

     、迋惗卮髮W用5年時間做了一個網絡研讀習慣的研究。報告說:“很明顯,用戶們不是在以傳統方式進行在線閱讀,相反,一種新‘閱讀’方式的跡象已經出現:用戶們在標題、內容頁和摘要之間進行著一視同仁的‘海量瀏覽’,以求快速得到結果。”

     、呒词共辉陔娔X前時,上網養成的閱讀習慣也會繼續回蕩在我們的腦細胞中。上網使我們的神經集中在略讀和多任務同時處理。以這種方式閱讀時,我們充其量只是一臺“信息解碼器”,而我們專注地進行深度閱讀時所形成的那種理解力、那種豐富的精神聯想,很大程度上都流失掉了。

     、嗝绹鸫髮W的丹尼爾·韋格納教授曾發現,結婚時間長的夫婦會依賴對方做自己的“記憶庫”?茖W家把這稱為“交互記憶”。交互記憶是“外部記憶庫”,就如同人們遇到不明白的問題會向專業人士請教一樣,而現在,互聯網也成為交互記憶的一種途徑。

     、峄ヂ摼W的知識儲存和查找功能助長了我們的惰性,我們不必記憶什么,因為任何知識都可以通過“復制”加“粘貼”來完成。這種便利讓人難以抗拒。但是,當我們開始利用網絡代替個人記憶,從而繞過鞏固記憶的內部過程時,我們就會面臨掏空大腦記憶的風險。

      (選自《發明與創新》)

      《網絡正在改變我們的大腦》閱讀題目:

      11. 根據文章內容,說說網絡改變了我們大腦的哪些方面。(3分)

      12. 文中劃線句中加點詞語“幾乎”能否去掉,說明理由。(2分)

      13. 第⑥段主要運用了什么說明方法,有何作用?(3分)

      《網絡正在改變我們的大腦》閱讀答案:

      11.(3分)改變了思維方式;改變了閱讀方式;改變了記憶方式。(每點1分,若有關鍵詞“思維、閱讀、記憶”等也可以得3分)

      12.(2分) 不能,“幾乎”表示接近之意,表明兩組新手經過短期互聯網的訓練對大腦活躍程度的影之大。(1分),如去掉就不符合客觀實際,“幾乎”體現了說明文語言的準確性(1分)

      13.(3分)作比較(1分),傳統方式的深度閱讀與網絡海量瀏覽的淺閱讀比較(1分),充分說明網絡正改變人們的閱讀方式(1分)。

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