新托福TPO 15综合写作详细解析：控制蔗蜍数量的方法
<p> 阅读材料：</p><p> <span word="The">The</span> <span word="cane">cane</span> <span word="toad">toad</span> <span word="is">is</span> <span word="a">a</span> <span word="large">large</span> (1.8 <span word="kg">kg</span>) <span word="amphibian">amphibian</span> <span word="species">species</span> <span word="native">native</span> <span word="to">to</span> <span word="Central">Central</span> <span word="and">and</span> <span word="South">South</span> <span word="America">America</span>. <span word="It">It</span> <span word="was">was</span> <span word="deliberately">deliberately</span> <span word="introduced">introduced</span> <span word="to">to</span> <span word="Australia">Australia</span> <span word="in">in</span> 1935 <span word="with">with</span> <span word="the">the</span> <span word="expectation">expectation</span> <span word="that">that</span> <span word="it">it</span> <span word="would">would</span> <span word="protect">protect</span> <span word="farmers">farmers</span> <span word="crops">crops</span> <span word="by">by</span> <span word="eating">eating</span> <span word="harmful">harmful</span> <span word="insects">insects</span>. <span word="Unfortunately">Unfortunately</span>, <span word="the">the</span> <span word="toad">toad</span> <span word="multiplied">multiplied</span> <span word="rapidly">rapidly</span>, <span word="and">and</span> <span word="a">a</span> <span word="large">large</span> <span word="cane">cane</span> <span word="toad">toad</span> <span word="population">population</span> <span word="now">now</span> <span word="threatens">threatens</span> <span word="small">small</span> <span word="native">native</span> <span word="animals">animals</span> <span word="that">that</span> <span word="are">are</span> <span word="not">not</span> <span word="pest">pest</span>. <span word="Several">Several</span> <span word="measures">measures</span> <span word="have">have</span> <span word="been">been</span> <span word="proposed">proposed</span> <span word="to">to</span> <span word="stop">stop</span> <span word="the">the</span> <span word="spread">spread</span> <span word="of">of</span> <span word="the">the</span> <span word="cane">cane</span> <span word="toad">toad</span> <span word="in">in</span> <span word="Australia">Australia</span>.</p><p> 蔗蜍是一种原产于中南美洲的两栖动物，个头很大，重大1.8公斤。蔗蜍是在1935年由人工引进至澳大利亚的。因为它们可以吃害虫，所以希望借由它们保护农作物。不幸的是，蔗蜍繁殖迅速。而且，数量巨大的蔗蜍群体已经开始威胁一些对农业无害的小型本土生物。现在提出了几个解决蔗蜍在澳大利亚蔓延的方法。</p><p> <span word="One">One</span> <span word="way">way</span> <span word="to">to</span> <span word="prevent">prevent</span> <span word="the">the</span> <span word="spread">spread</span> <span word="of">of</span> <span word="the">the</span> <span word="toad">toad</span> <span word="would">would</span> <span word="be">be</span> <span word="to">to</span> <span word="build">build</span> <span word="a">a</span> <span word="national">national</span> <span word="fence">fence</span>. <span word="A">A</span> <span word="fence">fence</span> <span word="that">that</span> <span word="blocks">blocks</span> <span word="the">the</span> <span word="advance">advance</span> <span word="of">of</span> <span word="the">the</span> <span word="toads">toads</span> <span word="will">will</span> <span word="prevent">prevent</span> <span word="them">them</span> <span word="from">from</span> <span word="moving">moving</span> <span word="into">into</span> <span word="those">those</span> <span word="parts">parts</span> <span word="of">of</span> <span word="Australia">Australia</span> <span word="that">that</span> <span word="they">they</span> <span word="have">have</span> <span word="not">not</span> <span word="yet">yet</span> <span word="colonized">colonized</span>. <span word="This">This</span> <span word="approach">approach</span> <span word="has">has</span> <span word="been">been</span> <span word="used">used</span> <span word="before">before</span>: <span word="a">a</span> <span word="national">national</span> <span word="fence">fence</span> <span word="was">was</span> <span word="erected">erected</span> <span word="in">in</span> <span word="the">the</span> <span word="early">early</span> <span word="part">part</span> <span word="of">of</span> <span word="the">the</span> <span word="twentieth">twentieth</span> <span word="century">century</span> <span word="to">to</span> <span word="prevent">prevent</span> <span word="the">the</span> <span word="spread">spread</span> <span word="of">of</span> <span word="rabbits">rabbits</span>, <span word="another">another</span> <span word="animal">animal</span> <span word="species">species</span> <span word="that">that</span> <span word="was">was</span> <span word="introduced">introduced</span> <span word="in">in</span> <span word="Australia">Australia</span> <span word="from">from</span> <span word="abroad">abroad</span> <span word="and">and</span> <span word="had">had</span> <span word="a">a</span> <span word="harmful">harmful</span> <span word="impact">impact</span> <span word="on">on</span> <span word="its">its</span> <span word="native">native</span> <span word="ecosystems">ecosystems</span>.</p><p> 第一个阻止蔗蜍蔓延的方法是建立一个全国范围的围栏。用围栏控制蔗蜍增长的方式是通过阻止它们迁徙实现的，这样它们就不会聚集到那些尚未被它们控制的地区了。这种方法以前就用过。在二十世界初期，澳大利亚就从用这种围栏阻止兔子的过度增长。兔子由澳大利亚从他国引进后，给当地的生态平衡造成了巨大的灾难。</p>
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