分析 地球上的所有生物都需要其他生命存活.没有生物可以独活.大多数动物必须生活在一个群体,甚至植物与同一类别植物生长在一起.有时一个生物杀死另一个,一个吃和另一个被吃.为了生活,每一种生命都吃另一种生命,他们一起构成了一个食物链.一些食物链是简单的,而其他的不是.但所有食物链都开始于太阳,如果一个链接消失,所有的食物链就会破碎.
所有的生命都需要阳光来生活.但只有植物可以直接使用阳光.植物是'工厂'.它们从阳光,水、土壤和空气中获得食物.在太阳能量被植物变成食物之后,动物就只能使用太阳能量了.一些动物直接吃植物,其他吃较小的动物.食肉动物只是间接地吃植物.
人类呢?我们是许多食物链中的成员,我们吃米饭,蔬菜和水果等等.我们也吃肉和喝牛奶.但我们经常打破食物链.我们杀死野生动物,也使河流、湖泊和海洋受到污染,当这些河流,湖泊和海洋被污染时,其中的鱼不能被食用.如果我们吃了这些鱼,我们会得奇怪的疾病.
每种形式的生命都关系到其他生命.破坏了这种链条会将所有的生命置于危险的境地.
解答 25.B.细节理解题.根据But only plants can use sunlight directly可知,只有植物可以直接利用阳光.故选B.
26.A.细节理解题.根据But we often break up the food chains可知,人类经常破坏食物链.故选A.
27.C.判断推理题.通过阅读全文可知,文章讲述了自然界中不同的食物链和不同生命在其中的作用,整篇文章都是围绕着食物链展开论述的.故本文的最好的题目应该是食物链.故选C.
点评 本文是一篇有关食物链的短文,做题时需要仔细阅读全文,了解文章大意,然后根据题目要再读文章,特别要注意细节的题目,应将题干与文章中的句型进行仔细的比较方能得出正确的答案.
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