分析 地球上的所有生物都需要其他生命存活.沒有生物可以獨活.大多數(shù)動物必須生活在一個群體,甚至植物與同一類別植物生長在一起.有時一個生物殺死另一個,一個吃和另一個被吃.為了生活,每一種生命都吃另一種生命,他們一起構成了一個食物鏈.一些食物鏈是簡單的,而其他的不是.但所有食物鏈都開始于太陽,如果一個鏈接消失,所有的食物鏈就會破碎.
所有的生命都需要陽光來生活.但只有植物可以直接使用陽光.植物是'工廠'.它們從陽光,水、土壤和空氣中獲得食物.在太陽能量被植物變成食物之后,動物就只能使用太陽能量了.一些動物直接吃植物,其他吃較小的動物.食肉動物只是間接地吃植物.
人類呢?我們是許多食物鏈中的成員,我們吃米飯,蔬菜和水果等等.我們也吃肉和喝牛奶.但我們經(jīng)常打破食物鏈.我們殺死野生動物,也使河流、湖泊和海洋受到污染,當這些河流,湖泊和海洋被污染時,其中的魚不能被食用.如果我們吃了這些魚,我們會得奇怪的疾。
每種形式的生命都關系到其他生命.破壞了這種鏈條會將所有的生命置于危險的境地.
解答 25.B.細節(jié)理解題.根據(jù)But only plants can use sunlight directly可知,只有植物可以直接利用陽光.故選B.
26.A.細節(jié)理解題.根據(jù)But we often break up the food chains可知,人類經(jīng)常破壞食物鏈.故選A.
27.C.判斷推理題.通過閱讀全文可知,文章講述了自然界中不同的食物鏈和不同生命在其中的作用,整篇文章都是圍繞著食物鏈展開論述的.故本文的最好的題目應該是食物鏈.故選C.
點評 本文是一篇有關食物鏈的短文,做題時需要仔細閱讀全文,了解文章大意,然后根據(jù)題目要再讀文章,特別要注意細節(jié)的題目,應將題干與文章中的句型進行仔細的比較方能得出正確的答案.
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