六级冲刺练习：阅读（141）
<p> <span word="Vegetable">Vegetable</span> <span word="oil">oil</span> <span word="has">has</span> <span word="been">been</span> <span word="known">known</span> <span word="from">from</span> <span word="antiquity">antiquity</span>. <span word="No">No</span> <span word="household">household</span> <span word="can">can</span> <span word="get">get</span> <span word="on">on</span> <span word="without">without</span> <span word="it">it</span>, <span word="for">for</span> <span word="it">it</span> <span word="is">is</span> <span word="used">used</span> <span word="in">in</span> <span word="cooking">cooking</span>. <span word="Perfumes">Perfumes</span> <span word="may">may</span> <span word="be">be</span> <span word="made">made</span> <span word="from">from</span> <span word="the">the</span> <span word="oils">oils</span> <span word="of">of</span> <span word="certain">certain</span> <span word="flowers">flowers</span>. <span word="Soaps">Soaps</span> <span word="are">are</span> <span word="made">made</span> <span word="from">from</span> <span word="vegetable">vegetable</span> <span word="and">and</span> <span word="animal">animal</span> <span word="oils">oils</span>.</p><p> <span word="To">To</span> <span word="the">the</span> <span word="ordinary">ordinary</span> <span word="man">man</span>, <span word="one">one</span> <span word="kind">kind</span> <span word="of">of</span> <span word="oil">oil</span> <span word="may">may</span> <span word="be">be</span> <span word="as">as</span> <span word="important">important</span> <span word="as">as</span> <span word="another">another</span>. <span word="But">But</span> <span word="when">when</span> <span word="the">the</span> <span word="politician">politician</span> <span word="or">or</span> <span word="the">the</span> <span word="engineer">engineer</span> <span word="refers">refers</span> <span word="to">to</span> <span word="oil">oil</span>, <span word="he">he</span> <span word="almost">almost</span> <span word="always">always</span> <span word="means">means</span> <span word="mineral">mineral</span> <span word="oil">oil</span> <span word="the">the</span> <span word="oil">oil</span> <span word="that">that</span> <span word="drives">drives</span> <span word="tanks">tanks</span>, <span word="aeroplanes">aeroplanes</span> <span word="and">and</span> <span word="warships">warships</span>, <span word="motor">motor</span>-<span word="cars">cars</span> <span word="and">and</span> <span word="diesel">diesel</span> <span word="locomotives">locomotives</span>; <span word="the">the</span> <span word="oil">oil</span> <span word="that">that</span> <span word="is">is</span> <span word="used">used</span> <span word="to">to</span> <span word="lubricate">lubricate</span> <span word="all">all</span> <span word="kinds">kinds</span> <span word="of">of</span> <span word="machinery">machinery</span>. <span word="This">This</span> <span word="is">is</span> <span word="the">the</span> <span word="oil">oil</span> <span word="that">that</span> <span word="has">has</span> <span word="changed">changed</span> <span word="the">the</span> <span word="life">life</span> <span word="of">of</span> <span word="the">the</span> <span word="common">common</span> <span word="man">man</span>. <span word="When">When</span> <span word="it">it</span> <span word="is">is</span> <span word="refined">refined</span> <span word="into">into</span> <span word="petrol">petrol</span> <span word="it">it</span> <span word="is">is</span> <span word="used">used</span> <span word="to">to</span> <span word="drive">drive</span> <span word="the">the</span> <span word="internal">internal</span> <span word="combustion">combustion</span> <span word="engine">engine</span>. <span word="To">To</span> <span word="it">it</span> <span word="we">we</span> <span word="owe">owe</span> <span word="the">the</span> <span word="existence">existence</span> <span word="of">of</span> <span word="the">the</span> <span word="motor">motor</span>-<span word="car">car</span>, <span word="which">which</span> <span word="has">has</span> <span word="replaced">replaced</span> <span word="the">the</span> <span word="private">private</span> <span word="carriage">carriage</span> <span word="drawn">drawn</span> <span word="by">by</span> <span word="the">the</span> <span word="horse">horse</span>. <span word="To">To</span> <span word="it">it</span> <span word="we">we</span> <span word="owe">owe</span> <span word="the">the</span> <span word="possibility">possibility</span> <span word="of">of</span> <span word="flying">flying</span>. <span word="It">It</span> <span word="has">has</span> <span word="changed">changed</span> <span word="the">the</span> <span word="methods">methods</span> <span word="of">of</span> <span word="warfare">warfare</span> <span word="on">on</span> <span word="land">land</span> <span word="and">and</span> <span word="sea">sea</span>. <span word="This">This</span> <span word="kind">kind</span> <span word="of">of</span> <span word="oil">oil</span> <span word="comes">comes</span> <span word="out">out</span> <span word="of">of</span> <span word="the">the</span> <span word="earth">earth</span>. <span word="Because">Because</span> <span word="it">it</span> <span word="burns">burns</span> <span word="well">well</span>, <span word="it">it</span> <span word="is">is</span> <span word="used">used</span> <span word="as">as</span> <span word="fuel">fuel</span> <span word="and">and</span> <span word="in">in</span> <span word="some">some</span> <span word="ways">ways</span> <span word="it">it</span> <span word="is">is</span> <span word="superior">superior</span> <span word="to">to</span> <span word="coal">coal</span> <span word="in">in</span> <span word="this">this</span> <span word="respect">respect</span>. <span word="Many">Many</span> <span word="big">big</span> <span word="ships">ships</span> <span word="now">now</span> <span word="burn">burn</span> <span word="oil">oil</span> <span word="instead">instead</span> <span word="of">of</span> <span word="coal">coal</span>. <span word="Because">Because</span> <span word="it">it</span> <span word="burns">burns</span> <span word="brightly">brightly</span>, <span word="it">it</span> <span word="is">is</span> <span word="used">used</span> <span word="for">for</span> <span word="illumination">illumination</span>; <span word="countless">countless</span> <span word="homes">homes</span> <span word="are">are</span> <span word="still">still</span> <span word="illuminated">illuminated</span> <span word="with">with</span> <span word="oil">oil</span>-<span word="burning">burning</span> <span word="lamps">lamps</span>. <span word="Because">Because</span> <span word="it">it</span> <span word="is">is</span> <span word="very">very</span> <span word="slippery">slippery</span>, <span word="it">it</span> <span word="is">is</span> <span word="used">used</span> <span word="for">for</span> <span word="lubrication">lubrication</span>. <span word="Two">Two</span> <span word="metal">metal</span> <span word="surfaces">surfaces</span> <span word="rubbing">rubbing</span> <span word="together">together</span> <span word="cause">cause</span> <span word="friction">friction</span> <span word="and">and</span> <span word="heat">heat</span>; <span word="but">but</span> <span word="if">if</span> <span word="they">they</span> <span word="are">are</span> <span word="separated">separated</span> <span word="by">by</span> <span word="a">a</span> <span word="thin">thin</span> <span word="film">film</span> <span word="of">of</span> <span word="oil">oil</span>, <span word="the">the</span> <span word="friction">friction</span> <span word="and">and</span> <span word="heat">heat</span> <span word="are">are</span> <span word="reduced">reduced</span>. <span word="No">No</span> <span word="machine">machine</span> <span word="would">would</span> <span word="work">work</span> <span word="for">for</span> <span word="long">long</span> <span word="if">if</span> <span word="it">it</span> <span word="were">were</span> <span word="not">not</span> <span word="properly">properly</span> <span word="lubricated">lubricated</span>. <span word="The">The</span> <span word="oil">oil</span> <span word="used">used</span> <span word="for">for</span> <span word="this">this</span> <span word="purpose">purpose</span> <span word="must">must</span> <span word="be">be</span> <span word="of">of</span> <span word="the">the</span> <span word="correct">correct</span> <span word="thickness">thickness</span>; <span word="if">if</span> <span word="it">it</span> <span word="is">is</span> <span word="too">too</span> <span word="thin">thin</span> <span word="it">it</span> <span word="will">will</span> <span word="not">not</span> <span word="give">give</span> <span word="sufficient">sufficient</span> <span word="lubrication">lubrication</span>, <span word="and">and</span> <span word="if">if</span> <span word="it">it</span> <span word="is">is</span> <span word="too">too</span> <span word="thick">thick</span> <span word="it">it</span> <span word="will">will</span> <span word="not">not</span> <span word="reach">reach</span> <span word="all">all</span> <span word="parts">parts</span> <span word="that">that</span> <span word="must">must</span> <span word="be">be</span> <span word="lubricated">lubricated</span>.</p>
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