2015年职称英语阅读理解综合类考试练习(4)
<p> <span word="Unidentified">Unidentified</span> <span word="Flying">Flying</span> <span word="Object">Object</span></p><p> <span word="Unidentified">Unidentified</span> <span word="Flying">Flying</span> <span word="Object">Object</span> is any object or light, reportedly sighted in the sky, that cannot be immediately explained by the observer. Sightings of unusual flying objects date back to ancient times, but UFOs became widely discussed only after the first widely publicized U.S. sighting in 1947. Many thousands of such observations have since been reported worldwide.</p><p> <span word="At">At</span> <span word="least">least</span> 90 <span word="percent">percent</span> <span word="of">of</span> <span word="UFO">UFO</span> <span word="sightings">sightings</span> <span word="can">can</span> <span word="be">be</span> <span word="identified">identified</span> <span word="as">as</span> <span word="conventional">conventional</span> <span word="objects">objects</span>, <span word="although">although</span> <span word="time">time</span>-<span word="consuming">consuming</span> <span word="investigations">investigations</span> <span word="are">are</span> <span word="often">often</span> <span word="necessary">necessary</span> <span word="for">for</span> <span word="such">such</span> <span word="identification">identification</span>. <span word="The">The</span> <span word="objects">objects</span> <span word="most">most</span> <span word="often">often</span> <span word="mistaken">mistaken</span> <span word="for">for</span> <span word="UFOs">UFOs</span> <span word="are">are</span> <span word="bright">bright</span> <span word="planets">planets</span> <span word="and">and</span> <span word="stars">stars</span>, <span word="aircraft">aircraft</span>, <span word="birds">birds</span>, <span word="balloons">balloons</span>, <span word="kites">kites</span>, <span word="aerial">aerial</span> <span word="flares">flares</span>, <span word="peculiar">peculiar</span> <span word="clouds">clouds</span> , <span word="meteors">meteors</span>, <span word="and">and</span> <span word="satellites">satellites</span>. <span word="The">The</span> <span word="remaining">remaining</span> <span word="sightings">sightings</span> <span word="most">most</span> <span word="likely">likely</span> <span word="can">can</span> <span word="be">be</span> <span word="attributed">attributed</span> <span word="to">to</span> <span word="other">other</span> <span word="mistaken">mistaken</span> <span word="sightings">sightings</span> <span word="or">or</span> <span word="to">to</span> <span word="inaccurate">inaccurate</span> <span word="reporting">reporting</span>, <span word="tricks">tricks</span>, <span word="or">or</span> <span word="delusions">delusions</span>, <span word="although">although</span> <span word="to">to</span> <span word="disprove">disprove</span> <span word="all">all</span> <span word="claims">claims</span> <span word="made">made</span> <span word="about">about</span> <span word="UFOs">UFOs</span> <span word="is">is</span> <span word="impossible">impossible</span>.</p><p> <span word="From">From</span> 1947 <span word="to">to</span> 1969 <span word="the">the</span> <span word="U">U</span>.<span word="S">S</span>. <span word="Air">Air</span> <span word="Force">Force</span> <span word="investigated">investigated</span> <span word="UFOs">UFOs</span> <span word="as">as</span> <span word="a">a</span> <span word="possible">possible</span> <span word="threat">threat</span> <span word="to">to</span> <span word="national">national</span> <span word="security">security</span>. <span word="A">A</span> <span word="total">total</span> <span word="of">of</span> 12,618 <span word="reports">reports</span> <span word="were">were</span> <span word="received">received</span>, <span word="of">of</span> <span word="which">which</span> 701 <span word="reports">reports</span>, <span word="or">or</span> 5.6 <span word="percent">percent</span>, <span word="were">were</span> <span word="listed">listed</span> <span word="as">as</span> <span word="unexplained">unexplained</span>. <span word="The">The</span> <span word="air">air</span> <span word="force">force</span> <span word="concluded">concluded</span> <span word="that">that</span> <span word="no">no</span> <span word="UFO">UFO</span> <span word="reported">reported</span>, <span word="investigated">investigated</span>, <span word="and">and</span> <span word="evaluated">evaluated</span> <span word="by">by</span> <span word="the">the</span> <span word="Air">Air</span> <span word="Force">Force</span> <span word="has">has</span> <span word="ever">ever</span> <span word="given">given</span> <span word="any">any</span> <span word="indication">indication</span> <span word="of">of</span> <span word="threat">threat</span> <span word="to">to</span> <span word="our">our</span> <span word="national">national</span> <span word="security">security</span>. <span word="Since">Since</span> 1969 <span word="no">no</span> <span word="agency">agency</span> <span word="of">of</span> <span word="the">the</span> <span word="U">U</span>.<span word="S">S</span>. <span word="government">government</span> <span word="has">has</span> <span word="had">had</span> <span word="any">any</span> <span word="active">active</span> <span word="program">program</span> <span word="of">of</span> <span word="UFO">UFO</span> <span word="investigation">investigation</span>.</p><p> <span word="Some">Some</span> <span word="persons">persons</span>, <span word="however">however</span>, <span word="believe">believe</span> <span word="that">that</span> <span word="UFOs">UFOs</span> <span word="are">are</span> <span word="extraterrestrial">extraterrestrial</span> <span word="spacecraft">spacecraft</span>, <span word="even">even</span> <span word="though">though</span> <span word="no">no</span> <span word="scientifically">scientifically</span> <span word="valid">valid</span> <span word="evidence">evidence</span> <span word="supports">supports</span> <span word="that">that</span> <span word="belief">belief</span>. <span word="The">The</span> <span word="possibility">possibility</span> <span word="of">of</span> <span word="extraterrestrial">extraterrestrial</span> <span word="civilizations">civilizations</span> <span word="is">is</span> <span word="not">not</span> <span word="the">the</span> <span word="stumbling">stumbling</span> <span word="block">block</span>; <span word="most">most</span> <span word="scientists">scientists</span> <span word="grant">grant</span> <span word="that">that</span> <span word="intelligent">intelligent</span> <span word="life">life</span> <span word="may">may</span> <span word="well">well</span> <span word="exist">exist</span> <span word="elsewhere">elsewhere</span> <span word="in">in</span> <span word="the">the</span> <span word="universe">universe</span>. <span word="A">A</span> <span word="fully">fully</span> <span word="convincing">convincing</span> <span word="UFO">UFO</span> <span word="photograph">photograph</span> <span word="has">has</span> <span word="yet">yet</span> <span word="to">to</span> <span word="be">be</span> <span word="taken">taken</span>, <span word="however">however</span>, <span word="and">and</span> <span word="the">the</span> <span word="scientific">scientific</span> <span word="method">method</span> <span word="requires">requires</span> <span word="that">that</span> <span word="highly">highly</span> <span word="speculative">speculative</span> <span word="explanations">explanations</span> <span word="should">should</span> <span word="not">not</span> <span word="be">be</span> <span word="adopted">adopted</span> <span word="unless">unless</span> <span word="all">all</span> <span word="of">of</span> <span word="the">the</span> <span word="more">more</span> <span word="ordinary">ordinary</span> <span word="explanations">explanations</span> <span word="can">can</span> <span word="be">be</span> <span word="ruled">ruled</span> <span word="out">out</span>.</p>
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