分析 地球上的所有生物都需要其他生命存活.沒(méi)有生物可以獨(dú)活.大多數(shù)動(dòng)物必須生活在一個(gè)群體,甚至植物與同一類(lèi)別植物生長(zhǎng)在一起.有時(shí)一個(gè)生物殺死另一個(gè),一個(gè)吃和另一個(gè)被吃.為了生活,每一種生命都吃另一種生命,他們一起構(gòu)成了一個(gè)食物鏈.一些食物鏈?zhǔn)呛?jiǎn)單的,而其他的不是.但所有食物鏈都開(kāi)始于太陽(yáng),如果一個(gè)鏈接消失,所有的食物鏈就會(huì)破碎.
所有的生命都需要陽(yáng)光來(lái)生活.但只有植物可以直接使用陽(yáng)光.植物是'工廠'.它們從陽(yáng)光,水、土壤和空氣中獲得食物.在太陽(yáng)能量被植物變成食物之后,動(dòng)物就只能使用太陽(yáng)能量了.一些動(dòng)物直接吃植物,其他吃較小的動(dòng)物.食肉動(dòng)物只是間接地吃植物.
人類(lèi)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(dòng)物,也使河流、湖泊和海洋受到污染,當(dāng)這些河流,湖泊和海洋被污染時(shí),其中的魚(yú)不能被食用.如果我們吃了這些魚(yú),我們會(huì)得奇怪的疾。
每種形式的生命都關(guān)系到其他生命.破壞了這種鏈條會(huì)將所有的生命置于危險(xiǎn)的境地.
解答 25.B.細(xì)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(yáng)光.故選B.
26.A.細(xì)節(jié)理解題.根據(jù)But we often break up the food chains可知,人類(lèi)經(jīng)常破壞食物鏈.故選A.
27.C.判斷推理題.通過(guò)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(kāi)論述的.故本文的最好的題目應(yīng)該是食物鏈.故選C.
點(diǎn)評(píng) 本文是一篇有關(guān)食物鏈的短文,做題時(shí)需要仔細(xì)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(xì)節(jié)的題目,應(yīng)將題干與文章中的句型進(jìn)行仔細(xì)的比較方能得出正確的答案.
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