2014年职称英语考试(综合类)阅读理解试题及答案(4)
<p> <span word="Unidentified">Unidentified</span> <span word="Flying">Flying</span> <span word="Object">Object</span> <span word="is">is</span> <span word="any">any</span> <span word="object">object</span> <span word="or">or</span> <span word="light">light</span>, <span word="reportedly">reportedly</span> <span word="sighted">sighted</span> <span word="in">in</span> <span word="the">the</span> <span word="sky">sky</span>, <span word="that">that</span> <span word="cannot">cannot</span> <span word="be">be</span> <span word="immediately">immediately</span> <span word="explained">explained</span> <span word="by">by</span> <span word="the">the</span> <span word="observer">observer</span>. <span word="Sightings">Sightings</span> <span word="of">of</span> <span word="unusual">unusual</span> <span word="flying">flying</span> <span word="objects">objects</span> <span word="date">date</span> <span word="back">back</span> <span word="to">to</span> <span word="ancient">ancient</span> <span word="times">times</span>, <span word="but">but</span> <span word="UFOs">UFOs</span> <span word="became">became</span> <span word="widely">widely</span> <span word="discussed">discussed</span> <span word="only">only</span> <span word="after">after</span> <span word="the">the</span> <span word="first">first</span> <span word="widely">widely</span> <span word="publicized">publicized</span> <span word="U">U</span>.<span word="S">S</span>. <span word="sighting">sighting</span> <span word="in">in</span> 1947. <span word="Many">Many</span> <span word="thousands">thousands</span> <span word="of">of</span> <span word="such">such</span> <span word="observations">observations</span> <span word="have">have</span> <span word="since">since</span> <span word="been">been</span> <span word="reported">reported</span> <span word="worldwide">worldwide</span>.</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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