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  • 說明文閱讀及答案《未來的糧倉》

    時間:2018-12-27 09:36:14  來源:第九閱讀網  作者:佚名  影響:

    說明文閱讀及答案:未來的糧倉

    ①人口劇增,資源短缺,這是當今人類面臨的最嚴重的環境問題之一。顯然,能否妥善地解決這一問題,直接關系到人類未來的生死存亡。

    ②資源短缺的表現之一,是可耕土地資源不足,糧食生產的增長趕不上人口的增長。正是出于這樣的考慮,許多人紛紛發出警告:地球將無法養活超過100億的人口。然而,一些樂觀的人士反對這種危言聳聽的說法。他們認為,雖然陸地上可耕地的開發已近極限,但地球上還有廣闊的海洋可供開發,大海完全有可能成為人類未來的糧倉。

    ③當然,海洋所能提供給我們的并不是傳統意義上的糧食——大米、小麥和玉米等,而是廣義的糧食——其他的能夠滿足人類營養需要的食物。一些海洋學家指出:僅僅是位于近海水域自然生長的海藻,每年的生長量就已相當于目前世界小麥年產量的15倍。如果把這些藻類加工成食品,就可以為人類提供足夠的蛋白質。

    ④其實,把藻類作為食品,我們并不陌生。僅以我國沿海來說,人們比較熟悉的可食用藻類就有:褐藻類的海帶、裙帶菜、羊棲菜、馬尾藻;紅藻類的紫菜、鷓鴣菜、石花菜;綠藻類的石莼、滸苔等。它們在人工的精心養殖下,產量正在不斷增加。其中僅海帶一種,目前年產量就比早先的野生狀態下提高了2000多倍,可見增產潛力是多么巨大!在國外,人們還培育出一種藻類新品種,據說在1公頃水面上生產的這種藻類,經加工后可獲得20噸蛋白質、多種維生素以及人體所需的礦物質。這相當于陸地上耕種40公頃土地生產的大豆所能提供的同類營養物。

    ⑤除海藻類,海洋中還有豐富的肉眼看不見的浮游生物。有人作過計算,若能把它們捕撈出來,加工成食品,足可滿足300億人的需要。當然,前提是,不破壞生態平衡。

    ⑥至于海洋中眾多的魚蝦,則更是人們熟悉的食物。盡管近海的魚蝦捕撈已近極限,但我們還可以開辟遠洋漁場,發展深海漁業。例如南極的鱗蝦,每年的產量可高達50億噸,我們只要捕獲其中的1億—1.5億噸,就比當今全世界一年的捕魚量多出1倍以上。何況,在深海和遠洋中還有許許多多尚未被我們充分開發利用的海洋生物,其巨大潛力是不言而喻的。綜上所述,說大海是人類未來的糧倉,一點兒也不夸張。

    1、第①段中加點的詞“之一”能否去掉?為什么?

    2、第②段中提到了“資源短缺的表現之一,是可耕土地資源不足”,其實,“資源短缺”的表現還有很多,作者為什么沒有具體加以說明?

    3、第⑥段中劃線部分運用了_____ 、______ 、______ 的說明方法,形象地說明了_____。

    4、本文是從哪幾方面來說明“大海完全有可能成為人類未來的糧倉”的?

    5、6月5日是世界環境日,結合所學知識談談你對去年世界環境日的主題——“海洋存亡,匹夫有責”的理解。(2分)

    版權聲明:以上文章中所選用的圖片及文字來源于網絡以及用戶投稿,由于未聯系到知識產權人或未發現有關知識產權的登記,如有知識產權人并不愿意我們使用,如果有侵權請立即聯系我們,我們立即下架或刪除。

    (tag標簽: )


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