生物链很重要
<p>科学课上，科学老师告诉了我们，我们不可以去任意的猎捕生物，因为每一个生物都和许许多多的生物有关。以前有一个国家猎捕狼，之后，狼所剩无几了但是情况没有好转，因为牛羊大批大批的繁衍，结果草原的草不够了，变成了另一种灾难。</p><p><span word="In">In</span> <span word="the">the</span> <span word="science">science</span> <span word="class">class</span>, <span word="the">the</span> <span word="science">science</span> <span word="teacher">teacher</span> <span word="told">told</span> <span word="us">us</span> <span word="that">that</span> <span word="we">we</span> <span word="can">can</span>'<span word="t">t</span> <span word="hunt">hunt</span> <span word="animals">animals</span> <span word="at">at</span> <span word="will">will</span>, <span word="because">because</span> <span word="every">every</span> <span word="creature">creature</span> <span word="is">is</span> <span word="related">related</span> <span word="to">to</span> <span word="many">many</span> <span word="creatures">creatures</span>. <span word="There">There</span> <span word="used">used</span> <span word="to">to</span> <span word="be">be</span> <span word="a">a</span> <span word="country">country</span> <span word="that">that</span> <span word="hunted">hunted</span> <span word="wolves">wolves</span>. <span word="After">After</span> <span word="that">that</span>, <span word="there">there</span> <span word="were">were</span> <span word="few">few</span> <span word="wolves">wolves</span> <span word="left">left</span>, <span word="but">but</span> <span word="the">the</span> <span word="situation">situation</span> <span word="did">did</span> <span word="not">not</span> <span word="get">get</span> <span word="better">better</span>. <span word="Because">Because</span> <span word="of">of</span> <span word="the">the</span> <span word="large">large</span>-<span word="scale">scale</span> <span word="reproduction">reproduction</span> <span word="of">of</span> <span word="cattle">cattle</span> <span word="and">and</span> <span word="sheep">sheep</span>, <span word="there">there</span> <span word="was">was</span> <span word="not">not</span> <span word="enough">enough</span> <span word="grass">grass</span> <span word="on">on</span> <span word="the">the</span> <span word="grassland">grassland</span>, <span word="which">which</span> <span word="became">became</span> <span word="another">another</span> <span word="disaster">disaster</span>.</p><p>如果把蚊子、苍蝇……那一些害虫消灭了，反而还会危及到益虫，为什么叫益虫呢？大多是因为他可以消灭害虫，如果害虫被消灭光了，那么益虫都会被饿死，也有可能因为食物的关系，变成更强大的害虫，这也不是没有可能，熊猫以前不是吃肉的吗？为什么现在改成吃素的了，这都是因为生物链被别人破坏了。</p><p><span word="If">If</span> <span word="mosquitoes">mosquitoes</span>, <span word="flies">flies</span> <span word="When">When</span> <span word="some">some</span> <span word="pests">pests</span> <span word="are">are</span> <span word="eliminated">eliminated</span>, <span word="they">they</span> <span word="will">will</span> <span word="endanger">endanger</span> <span word="beneficial">beneficial</span> <span word="insects">insects</span>. <span word="Why">Why</span> <span word="is">is</span> <span word="it">it</span> <span word="called">called</span> <span word="beneficial">beneficial</span> <span word="insects">insects</span>? <span word="Most">Most</span> <span word="of">of</span> <span word="it">it</span> <span word="is">is</span> <span word="because">because</span> <span word="it">it</span> <span word="can">can</span> <span word="kill">kill</span> <span word="pests">pests</span>. <span word="If">If</span> <span word="the">the</span> <span word="pests">pests</span> <span word="are">are</span> <span word="wiped">wiped</span> <span word="out">out</span>, <span word="all">all</span> <span word="the">the</span> <span word="beneficial">beneficial</span> <span word="insects">insects</span> <span word="will">will</span> <span word="starve">starve</span> <span word="to">to</span> <span word="death">death</span>. <span word="It">It</span> <span word="is">is</span> <span word="also">also</span> <span word="possible">possible</span> <span word="that">that</span> <span word="they">they</span> <span word="will">will</span> <span word="become">become</span> <span word="more">more</span> <span word="powerful">powerful</span> <span word="pests">pests</span> <span word="because">because</span> <span word="of">of</span> <span word="the">the</span> <span word="food">food</span>. <span word="Isn">Isn</span>'<span word="t">t</span> <span word="it">it</span> <span word="impossible">impossible</span> <span word="that">that</span> <span word="pandas">pandas</span> <span word="used">used</span> <span word="to">to</span> <span word="eat">eat</span> <span word="meat">meat</span>? <span word="Why">Why</span> <span word="is">is</span> <span word="it">it</span> <span word="now">now</span> <span word="vegetarian">vegetarian</span>? <span word="It">It</span>'<span word="s">s</span> <span word="because">because</span> <span word="the">the</span> <span word="biological">biological</span> <span word="chain">chain</span> <span word="has">has</span> <span word="been">been</span> <span word="destroyed">destroyed</span> <span word="by">by</span> <span word="others">others</span>.</p>
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