2015考研英语阅读蛇颈龙的家族生活
<p> <span word="Prehistoric">Prehistoric</span> <span word="reptiles">reptiles</span> <span word="A">A</span> <span word="loving">loving</span> <span word="mother">mother</span></p><p> 史前爬行动物 慈母</p><p> <span word="Family">Family</span> <span word="life">life</span> <span word="in">in</span> <span word="plesiosaurs">plesiosaurs</span></p><p> 蛇颈龙的家族生活</p><p> <span word="THE">THE</span> <span word="Mesozoic">Mesozoic</span> <span word="land">land</span> <span word="was">was</span> <span word="dominated">dominated</span> <span word="by">by</span> <span word="dinosaurs">dinosaurs</span>.</p><p> 中生代时期，恐龙统治着陆地。</p><p> <span word="At">At</span> <span word="sea">sea</span>, <span word="though">though</span>, <span word="the">the</span> <span word="most">most</span> <span word="abundant">abundant</span> <span word="reptiles">reptiles</span> <span word="were">were</span> <span word="the">the</span> <span word="ichthyosaurs">ichthyosaurs</span> <span word="and">and</span> <span word="plesiosaurs">plesiosaurs</span>.</p><p> 但是在海里，最繁盛的爬行动物要属鱼龙和蛇颈龙了。</p><p> <span word="Roughly">Roughly</span> <span word="speaking">speaking</span>, <span word="these">these</span> <span word="animals">animals</span> <span word="filled">filled</span> <span word="the">the</span> <span word="ecological">ecological</span> <span word="niches">niches</span> <span word="now">now</span> <span word="occupied">occupied</span> <span word="by">by</span> <span word="toothedcetaceans">toothedcetaceans</span> <span word="such">such</span> <span word="as">as</span> <span word="dolphins">dolphins</span> <span word="and">and</span> <span word="killer">killer</span> <span word="whales">whales</span>.</p><p> 大致上讲，这些动物填补了由现代齿鲸目动物海豚和虎鲸所占据的生态龛位。</p><p> <span word="Ichthyosaurs">Ichthyosaurs</span>, <span word="indeed">indeed</span>, <span word="looked">looked</span> <span word="somewhat">somewhat</span> <span word="like">like</span> <span word="dolphins">dolphins</span>, <span word="though">though</span> <span word="plesiosaurswith">plesiosaurswith</span> <span word="their">their</span> <span word="longnecks">longnecks</span> <span word="and">and</span> <span word="diamond">diamond</span>-<span word="shaped">shaped</span> <span word="paddleswere">paddleswere</span> <span word="unlike">unlike</span> <span word="anything">anything</span> <span word="now">now</span> <span word="alive">alive</span>.</p><p> 鱼龙看上去的确有点象海豚，但拥有长颈和菱形鳍状前肢的蛇颈龙却与现存的任何动物不相类似。</p><p> <span word="Ichthyosaurs">Ichthyosaurs</span> <span word="also">also</span> <span word="resembled">resembled</span> <span word="cetaceans">cetaceans</span> <span word="in">in</span> <span word="another">another</span> <span word="way">way</span>: <span word="unlike">unlike</span> <span word="most">most</span> <span word="living">living</span> <span word="reptiles">reptiles</span>, <span word="which">which</span> <span word="layeggs">layeggs</span>, <span word="they">they</span> <span word="gave">gave</span> <span word="birth">birth</span> <span word="to">to</span> <span word="live">live</span> <span word="young">young</span>.</p><p> 鱼龙与鲸类动物还有另一点相似之处：大多数现存的爬行动物靠产卵繁殖，而鱼龙是通过怀胎产子的。</p><p> <span word="For">For</span> <span word="years">years</span>, <span word="palaeontologists">palaeontologists</span> <span word="have">have</span> <span word="wondered">wondered</span> <span word="if">if</span> <span word="the">the</span> <span word="same">same</span> <span word="was">was</span> <span word="true">true</span> <span word="of">of</span> <span word="plesiosaurs">plesiosaurs</span>.</p>
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