职称英语理工类AB级阅读理解精选练习(3)
<p> <span word="Hidden">Hidden</span> <span word="Species">Species</span> <span word="May">May</span> <span word="Be">Be</span> <span word="Surprisingly">Surprisingly</span> <span word="Common">Common</span> <span word="Reports">Reports</span> <span word="of">of</span> <span word="cryptic">cryptic</span> <span word="species">species</span> <span word="have">have</span> <span word="increased">increased</span> <span word="dramatically">dramatically</span> <span word="over">over</span> <span word="the">the</span> <span word="past">past</span> <span word="two">two</span> <span word="decades">decades</span> <span word="with">with</span> <span word="the">the</span> <span word="advent">advent</span> <span word="of">of</span> <span word="relatively">relatively</span> <span word="inexpensive">inexpensive</span> <span word="DNA">DNA</span> <span word="sequencing">sequencing</span> <span word="technology">technology</span>. <span word="Mark">Mark</span> <span word="Pfennninger">Pfennninger</span> <span word="and">and</span> <span word="Klaus">Klaus</span> <span word="Schwenk">Schwenk</span>, <span word="of">of</span> <span word="the">the</span> <span word="Goethe">Goethe</span>-<span word="Universitat">Universitat</span> <span word="in">in</span> <span word="Frankfurts">Frankfurts</span> <span word="Germany">Germany</span>, <span word="analyzed">analyzed</span> <span word="all">all</span> <span word="known">known</span> <span word="data">data</span> <span word="on">on</span> <span word="cryptic">cryptic</span> <span word="animal">animal</span> <span word="species">species</span> <span word="aad">aad</span> <span word="discovered">discovered</span> <span word="that">that</span> <span word="they">they</span> <span word="are">are</span> <span word="found">found</span> <span word="in">in</span> <span word="equal">equal</span> <span word="proportions">proportions</span> <span word="throughout">throughout</span> <span word="all">all</span> <span word="major">major</span> <span word="branch">branch</span>, <span word="of">of</span> <span word="the">the</span> <span word="animal">animal</span> <span word="kingdom">kingdom</span> <span word="and">and</span> <span word="occur">occur</span> <span word="in">in</span> <span word="equal">equal</span> <span word="numbers">numbers</span> <span word="in">in</span> <span word="all">all</span> <span word="biogeographical">biogeographical</span> <span word="regions">regions</span>. <span word="m">m</span> <span word="extremely">extremely</span> <span word="surprised">surprised</span> <span word="by">by</span> <span word="their">their</span> <span word="results">results</span>. <span word="says">says</span> <span word="Alex">Alex</span> <span word="Smith">Smith</span> <span word="of">of</span> <span word="the">the</span> <span word="University">University</span> <span word="of">of</span> <span word="Guelph">Guelph</span>`<span word="Intririo">Intririo</span>. <span word="Canada">Canada</span>. <span word="Its">Its</span> <span word="a">a</span> <span word="call">call</span> <span word="to">to</span> <span word="arms">arms</span> <span word="to">to</span> <span word="keep">keep</span> <span word="doing">doing</span> <span word="the">the</span> <span word="broad">broad</span> <span word="kind">kind</span> <span word="of">of</span> <span word="genetic">genetic</span> <span word="studies">studies</span> <span word="that">that</span> <span word="we">we</span> <span word="are">are</span> <span word="doing">doing</span>. <span word="Examples">Examples</span> <span word="of">of</span> <span word="cryptic">cryptic</span> <span word="species">species</span> <span word="include">include</span> <span word="the">the</span> <span word="African">African</span> <span word="elephant">elephant</span>. <span word="A">A</span> 2001 <span word="study">study</span> <span word="found">found</span> <span word="the">the</span> <span word="elephants">elephants</span> <span word="were">were</span> <span word="actually">actually</span> <span word="two">two</span> <span word="genetically">genetically</span> <span word="distinct">distinct</span>.<span word="non">non</span>-<span word="interbreeding">interbreeding</span> <span word="species">species</span>, <span word="the">the</span> <span word="African">African</span> <span word="bush">bush</span> <span word="elephant">elephant</span> <span word="and">and</span> <span word="the">the</span> <span word="African">African</span> <span word="elephant">elephant</span>. <span word="The">The</span> <span word="species">species</span> <span word="are">are</span> <span word="currently">currently</span> <span word="listed">listed</span> <span word="as">as</span> <span word="vulnerable">vulnerable</span> <span word="and">and</span> <span word="threatened">threatened</span>, <span word="respectively">respectively</span>, <span word="by">by</span> <span word="the">the</span> <span word="World">World</span> <span word="Conservation">Conservation</span> <span word="Union">Union</span>. <span word="In">In</span> <span word="the">the</span> <span word="early">early</span> 1900<span word="s">s</span> <span word="misidentification">misidentification</span> <span word="mosquito">mosquito</span> <span word="species">species</span> <span word="based">based</span> <span word="on">on</span> <span word="morphology">morphology</span> <span word="confused">confused</span> <span word="attempts">attempts</span> <span word="to">to</span> <span word="control">control</span> <span word="malaria">malaria</span> <span word="in">in</span> <span word="Europe">Europe</span>. <span word="Ultimately">Ultimately</span>, <span word="what">what</span> <span word="was">was</span> <span word="thought">thought</span> <span word="to">to</span> <span word="be">be</span> <span word="a">a</span> <span word="single">single</span> <span word="species">species</span> <span word="was">was</span> <span word="actually">actually</span> <span word="made">made</span> <span word="up">up</span> <span word="of">of</span> <span word="six">six</span> <span word="sibling">sibling</span> <span word="species">species</span>, <span word="only">only</span> <span word="three">three</span> <span word="of">of</span> <span word="which">which</span> <span word="transmitted">transmitted</span> <span word="the">the</span> <span word="disease">disease</span>. <span word="The">The</span> <span word="basic">basic</span> <span word="unit">unit</span> <span word="in">in</span> <span word="biology">biology</span> <span word="is">is</span> <span word="always">always</span> <span word="the">the</span> <span word="species">species</span>, <span word="and">and</span> <span word="you">you</span> <span word="hav">hav</span> <span word="to">to</span> <span word="know">know</span> <span word="what">what</span> <span word="you">you</span> <span word="are">are</span> <span word="dealing">dealing</span> <span word="with">with</span>, <span word="Pfenninger">Pfenninger</span> <span word="said">said</span>. <span word="Much">Much</span> <span word="previous">previous</span> <span word="research">research</span> <span word="is">is</span> <span word="now">now</span> <span word="no">no</span> <span word="longer">longer</span> <span word="used">used</span>, <span word="he">he</span> <span word="says">says</span>, <span word="because">because</span> <span word="it">it</span> <span word="is">is</span> <span word="not">not</span> <span word="clear">clear</span> <span word="what">what</span> <span word="species">species</span> <span word="was">was</span> <span word="studied">studied</span>. <span word="A">A</span> <span word="The">The</span> <span word="results">results</span> <span word="of">of</span> <span word="the">the</span> <span word="research">research</span> <span word="can">can</span> <span word="help">help</span> <span word="the">the</span> <span word="development">development</span> <span word="of">of</span> <span word="many">many</span> <span word="other">other</span> <span word="research">research</span> <span word="areas">areas</span>: <span word="C">C</span> <span word="The">The</span> <span word="results">results</span> <span word="of">of</span> <span word="the">the</span> <span word="research">research</span> <span word="can">can</span> <span word="help">help</span> <span word="our">our</span> <span word="understanding">understanding</span> <span word="of">of</span> <span word="infectious">infectious</span> <span word="disease">disease</span> <span word="evolution">evolution</span>. 2. <span word="What">What</span> <span word="was">was</span> <span word="scientists">scientists</span> <span word="understanding">understanding</span> <span word="of">of</span> <span word="cryptic">cryptic</span> <span word="species">species</span>? <span word="B">B</span> <span word="They">They</span> <span word="were">were</span> <span word="mostly">mostly</span> <span word="found">found</span> <span word="in">in</span> <span word="insects">insects</span> <span word="and">and</span> <span word="reptiles">reptiles</span>. <span word="D">D</span> <span word="Both">Both</span> <span word="B">B</span> <span word="and">and</span> <span word="C">C</span> <span word="A">A</span> <span word="Not">Not</span> <span word="yet">yet</span>. <span word="C">C</span> <span word="They">They</span> <span word="will">will</span> <span word="know">know</span> <span word="the">the</span> <span word="answer">answer</span> <span word="in">in</span> <span word="another">another</span> <span word="one">one</span> <span word="or">or</span> <span word="two">two</span> <span word="years">years</span>. 4. <span word="Which">Which</span> <span word="of">of</span> <span word="the">the</span> <span word="following">following</span> <span word="about">about</span> <span word="the">the</span> <span word="African">African</span> <span word="bush">bush</span> <span word="elephant">elephant</span> <span word="and">and</span> <span word="the">the</span> <span word="African">African</span> <span word="elephant">elephant</span> <span word="is">is</span> <span word="true">true</span>? <span word="B">B</span> <span word="They">They</span> <span word="are">are</span> <span word="interbreeding">interbreeding</span> <span word="species">species</span>. <span word="D">D</span> <span word="They">They</span> <span word="depend">depend</span> <span word="on">on</span> <span word="each">each</span> <span word="other">other</span> <span word="for">for</span> <span word="survival">survival</span></p>
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