新托福TPO 4综合写作详细解析：恒温动物
<p> 阅读材料：</p><p> <span word="Endotherms">Endotherms</span> <span word="are">are</span> <span word="animals">animals</span> <span word="such">such</span> <span word="as">as</span> <span word="modern">modern</span> <span word="birds">birds</span> <span word="and">and</span> <span word="mammals">mammals</span> <span word="that">that</span> <span word="keep">keep</span> <span word="their">their</span> <span word="body">body</span> <span word="temperatures">temperatures</span> <span word="constant">constant</span>. <span word="For">For</span> <span word="instance">instance</span>, <span word="humans">humans</span> <span word="are">are</span> <span word="endotherms">endotherms</span> <span word="and">and</span> <span word="maintain">maintain</span> <span word="an">an</span> <span word="internal">internal</span> <span word="temperature">temperature</span> <span word="of">of</span> 37℃, <span word="no">no</span> <span word="matter">matter</span> <span word="whether">whether</span> <span word="the">the</span> <span word="environment">environment</span> <span word="is">is</span> <span word="warm">warm</span> <span word="or">or</span> <span word="cold">cold</span>. <span word="Because">Because</span> <span word="dinosaurs">dinosaurs</span> <span word="were">were</span> <span word="reptiles">reptiles</span>, <span word="and">and</span> <span word="modern">modern</span> <span word="reptiles">reptiles</span> <span word="are">are</span> <span word="not">not</span> <span word="endotherms">endotherms</span>, <span word="it">it</span> <span word="was">was</span> <span word="long">long</span> <span word="assumed">assumed</span> <span word="that">that</span> <span word="dinosaurs">dinosaurs</span> <span word="were">were</span> <span word="not">not</span> <span word="endotherms">endotherms</span>. <span word="However">However</span>, <span word="dinosaurs">dinosaurs</span> <span word="differ">differ</span> <span word="in">in</span> <span word="many">many</span> <span word="ways">ways</span> <span word="from">from</span> <span word="modern">modern</span> <span word="reptiles">reptiles</span>, <span word="and">and</span> <span word="there">there</span> <span word="is">is</span> <span word="now">now</span> <span word="considerable">considerable</span> <span word="evidence">evidence</span> <span word="that">that</span> <span word="dinosaurs">dinosaurs</span> <span word="were">were</span>, <span word="in">in</span> <span word="fact">fact</span>, <span word="endotherms">endotherms</span>.</p><p> 恒温动物是指诸如现代鸟类和哺乳动物这种可以保持体温恒定的动物。比如，人是恒温动物，无论环境温度是怎样，体温都维持在37℃。因为恐龙属于爬行动物，而现代的爬行动物都不属于恒温动物，所以长期以来恐龙都被当做是变温动物。然而，恐龙在很多地方都同现在的爬行动物不一致。同时，现在有大量的证据表明恐龙其实是恒温动物。</p><p> <span word="Polar">Polar</span> <span word="dinosaurs">dinosaurs</span></p><p> <span word="One">One</span> <span word="reason">reason</span> <span word="for">for</span> <span word="believing">believing</span> <span word="that">that</span> <span word="dinosaurs">dinosaurs</span> <span word="were">were</span> <span word="endotherms">endotherms</span> <span word="is">is</span> <span word="that">that</span> <span word="dinosaur">dinosaur</span> <span word="fossils">fossils</span> <span word="have">have</span> <span word="been">been</span> <span word="discovered">discovered</span> <span word="in">in</span> <span word="Polar">Polar</span> <span word="Regions">Regions</span>. <span word="Only">Only</span> <span word="animals">animals</span> <span word="that">that</span> <span word="can">can</span> <span word="maintain">maintain</span> <span word="a">a</span> <span word="temperature">temperature</span> <span word="well">well</span> <span word="above">above</span> <span word="that">that</span> <span word="of">of</span> <span word="the">the</span> <span word="surrounding">surrounding</span> <span word="environment">environment</span> <span word="could">could</span> <span word="be">be</span> <span word="active">active</span> <span word="in">in</span> <span word="such">such</span> <span word="cold">cold</span> <span word="climates">climates</span>.</p><p> 极地恐龙</p><p> 主张恐龙属于恒温动物的原因是在极地发现了恐龙。只有能够很好维持体温的动物才能在如此寒冷的地方生存。</p>
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