2015年职称英语理工类A级阅读理解练习(4)
<p> <span word="The">The</span> <span word="basic">basic</span> <span word="computer">computer</span> <span word="mouse">mouse</span> <span word="is">is</span> <span word="an">an</span> <span word="amazingly">amazingly</span> <span word="clever">clever</span> <span word="invention">invention</span> <span word="with">with</span> <span word="a">a</span> <span word="relatively">relatively</span> <span word="simple">simple</span> <span word="design">design</span> <span word="that">that</span> <span word="allows">allows</span> <span word="us">us</span> <span word="to">to</span> <span word="point">point</span> <span word="at">at</span> <span word="things">things</span> <span word="on">on</span> <span word="the">the</span> <span word="computer">computer</span> <span word="and">and</span> <span word="it">it</span> <span word="is">is</span> <span word="very">very</span> <span word="productive">productive</span>. <span word="Think">Think</span> <span word="of">of</span> <span word="all">all</span> <span word="the">the</span> <span word="things">things</span> <span word="you">you</span> <span word="can">can</span> <span word="do">do</span> <span word="with">with</span> <span word="a">a</span> <span word="mouse">mouse</span> <span word="like">like</span> <span word="selecting">selecting</span> <span word="text">text</span> <span word="for">for</span> <span word="copying">copying</span> <span word="and">and</span> <span word="pasting">pasting</span>, <span word="drawing">drawing</span>, <span word="and">and</span> <span word="even">even</span> <span word="scrolling">scrolling</span> <span word="on">on</span> <span word="the">the</span> <span word="page">page</span> <span word="with">with</span> <span word="the">the</span> <span word="newer">newer</span> <span word="mice">mice</span> <span word="with">with</span> <span word="the">the</span> <span word="wheel">wheel</span>. <span word="Most">Most</span> <span word="of">of</span> <span word="us">us</span> <span word="use">use</span> <span word="the">the</span> <span word="computer">computer</span> <span word="mouse">mouse</span> <span word="daily">daily</span> <span word="without">without</span> <span word="stopping">stopping</span> <span word="to">to</span> <span word="think">think</span> <span word="how">how</span> <span word="it">it</span> <span word="works">works</span> <span word="until">until</span> <span word="it">it</span> <span word="gets">gets</span> <span word="dirty">dirty</span> <span word="and">and</span> <span word="we">we</span> <span word="have">have</span> <span word="to">to</span> <span word="learn">learn</span> <span word="how">how</span> <span word="to">to</span> <span word="clean">clean</span> <span word="it">it</span>. <span word="We">We</span> <span word="learn">learn</span> <span word="to">to</span> <span word="point">point</span> <span word="at">at</span> <span word="thing">thing</span> <span word="before">before</span> <span word="we">we</span> <span word="learn">learn</span> <span word="to">to</span> <span word="speak">speak</span>, <span word="so">so</span> <span word="the">the</span> <span word="mouse">mouse</span> <span word="is">is</span> <span word="a">a</span> <span word="very">very</span> <span word="natural">natural</span> <span word="pointing">pointing</span> <span word="device">device</span>. <span word="Other">Other</span> <span word="computer">computer</span> <span word="pointing">pointing</span> <span word="devices">devices</span> <span word="include">include</span> <span word="light">light</span> <span word="pens">pens</span>, <span word="graphics">graphics</span> <span word="tablets">tablets</span> <span word="and">and</span> <span word="touch">touch</span> <span word="screen">screen</span>, <span word="but">but</span> <span word="the">the</span> <span word="mouse">mouse</span> <span word="still">still</span> <span word="our">our</span> <span word="workhorse">workhorse</span>.</p><p> <span word="The">The</span> <span word="computer">computer</span> <span word="mouse">mouse</span> <span word="was">was</span> <span word="invented">invented</span> <span word="in">in</span> 1964 <span word="by">by</span> <span word="Douglas">Douglas</span> <span word="Englehart">Englehart</span> <span word="of">of</span> <span word="Stanford">Stanford</span> <span word="University">University</span>. <span word="As">As</span> <span word="computer">computer</span> <span word="screens">screens</span> <span word="became">became</span> <span word="popular">popular</span> <span word="and">and</span> <span word="arrow">arrow</span> <span word="keys">keys</span> <span word="were">were</span> <span word="used">used</span> <span word="to">to</span> <span word="more">more</span> <span word="around">around</span> <span word="a">a</span> <span word="body">body</span> <span word="of">of</span> <span word="text">text</span>, <span word="it">it</span> <span word="became">became</span> <span word="clear">clear</span> <span word="that">that</span> <span word="a">a</span> <span word="pointing">pointing</span> <span word="device">device</span> <span word="that">that</span> <span word="allowed">allowed</span> <span word="easier">easier</span> <span word="motion">motion</span> <span word="through">through</span> <span word="the">the</span> <span word="text">text</span> <span word="and">and</span> <span word="even">even</span> <span word="selection">selection</span> <span word="of">of</span> <span word="text">text</span> <span word="would">would</span> <span word="be">be</span> <span word="very">very</span> <span word="useful">useful</span>. <span word="The">The</span> <span word="introduction">introduction</span> <span word="of">of</span> <span word="the">the</span> <span word="mouse">mouse</span>, <span word="with">with</span> <span word="the">the</span> <span word="Apple">Apple</span> <span word="Lisa">Lisa</span> <span word="computer">computer</span> <span word="in">in</span> 1983, <span word="really">really</span> <span word="started">started</span> <span word="the">the</span> <span word="computer">computer</span> <span word="public">public</span> <span word="on">on</span> <span word="the">the</span> <span word="road">road</span> <span word="to">to</span> <span word="relying">relying</span> <span word="on">on</span> <span word="the">the</span> <span word="mouse">mouse</span> <span word="for">for</span> <span word="routine">routine</span> <span word="computer">computer</span> <span word="tasks">tasks</span>.</p><p> <span word="How">How</span> <span word="does">does</span> <span word="the">the</span> <span word="mouse">mouse</span> <span word="work">work</span>? <span word="We">We</span> <span word="have">have</span> <span word="to">to</span> <span word="start">start</span> <span word="at">at</span> <span word="the">the</span> <span word="bottom">bottom</span>, <span word="so">so</span> <span word="think">think</span> <span word="upside">upside</span> <span word="down">down</span> <span word="for">for</span> <span word="now">now</span>. <span word="It">It</span> <span word="all">all</span> <span word="starts">starts</span> <span word="with">with</span> <span word="mouse">mouse</span> <span word="ball">ball</span>. <span word="As">As</span> <span word="the">the</span> <span word="mouse">mouse</span> <span word="ball">ball</span> <span word="in">in</span> <span word="the">the</span> <span word="bottom">bottom</span> <span word="of">of</span> <span word="the">the</span> <span word="mouse">mouse</span> <span word="rolls">rolls</span> <span word="over">over</span> <span word="the">the</span> <span word="mouse">mouse</span> <span word="pad">pad</span>, <span word="it">it</span> <span word="presses">presses</span> <span word="against">against</span> <span word="and">and</span> <span word="turns">turns</span> <span word="two">two</span> <span word="shafts">shafts</span>. <span word="The">The</span> <span word="shafts">shafts</span> <span word="are">are</span> <span word="connected">connected</span> <span word="to">to</span> <span word="wheels">wheels</span> <span word="with">with</span> <span word="several">several</span> <span word="small">small</span> <span word="holes">holes</span> <span word="in">in</span> <span word="them">them</span>. <span word="The">The</span> <span word="wheels">wheels</span> <span word="have">have</span> <span word="a">a</span> <span word="pair">pair</span> <span word="of">of</span> <span word="small">small</span> <span word="electronic">electronic</span> <span word="light">light</span>-<span word="emitting">emitting</span> <span word="devices">devices</span> <span word="called">called</span> <span word="light">light</span> <span word="emitting">emitting</span> <span word="diodes">diodes</span> <span word="mounted">mounted</span> <span word="on">on</span> <span word="either">either</span> <span word="side">side</span>. <span word="One">One</span> <span word="LED">LED</span> <span word="sends">sends</span> <span word="a">a</span> <span word="light">light</span> <span word="beam">beam</span> <span word="to">to</span> <span word="the">the</span> <span word="LED">LED</span> <span word="on">on</span> <span word="the">the</span> <span word="other">other</span> <span word="side">side</span>. <span word="As">As</span> <span word="the">the</span> <span word="wheels">wheels</span> <span word="spin">spin</span> <span word="and">and</span> <span word="a">a</span> <span word="hole">hole</span> <span word="rotates">rotates</span> <span word="by">by</span>, <span word="the">the</span> <span word="light">light</span> <span word="beam">beam</span> <span word="gets">gets</span> <span word="through">through</span> <span word="to">to</span> <span word="the">the</span> <span word="LED">LED</span> <span word="on">on</span> <span word="the">the</span> <span word="other">other</span> <span word="side">side</span>. <span word="But">But</span> <span word="a">a</span> <span word="moment">moment</span> <span word="later">later</span> <span word="the">the</span> <span word="light">light</span> <span word="beam">beam</span> <span word="is">is</span> <span word="blocked">blocked</span> <span word="until">until</span> <span word="the">the</span> <span word="next">next</span> <span word="hole">hole</span> <span word="is">is</span> <span word="in">in</span> <span word="place">place</span>. <span word="The">The</span> <span word="LED">LED</span> <span word="detects">detects</span> <span word="a">a</span> <span word="changing">changing</span> <span word="pattern">pattern</span> <span word="of">of</span> <span word="light">light</span>, <span word="converts">converts</span> <span word="the">the</span> <span word="pattern">pattern</span> <span word="into">into</span> <span word="an">an</span> <span word="electronic">electronic</span> <span word="signal">signal</span>, <span word="and">and</span> <span word="sends">sends</span> <span word="the">the</span> <span word="signal">signal</span> <span word="to">to</span> <span word="the">the</span> <span word="computer">computer</span> <span word="through">through</span> <span word="wires">wires</span> <span word="in">in</span> <span word="a">a</span> <span word="cable">cable</span> <span word="that">that</span> <span word="goes">goes</span> <span word="out">out</span> <span word="the">the</span> <span word="mouse">mouse</span> <span word="body">body</span>. <span word="This">This</span> <span word="cable">cable</span> <span word="is">is</span> <span word="the">the</span> <span word="tail">tail</span> <span word="that">that</span> <span word="helps">helps</span> <span word="give">give</span> <span word="the">the</span> <span word="mouse">mouse</span> <span word="its">its</span> <span word="name">name</span>. <span word="The">The</span> <span word="computer">computer</span> <span word="interprets">interprets</span> <span word="the">the</span> <span word="signal">signal</span> <span word="to">to</span> <span word="tell">tell</span> <span word="it">it</span> <span word="where">where</span> <span word="to">to</span> <span word="position">position</span> <span word="the">the</span> <span word="cursor">cursor</span> <span word="on">on</span> <span word="the">the</span> <span word="computer">computer</span> <span word="screen">screen</span>.</p>
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