阅读理解职称英语2015综合类必备练习(1)
<p> <span word="Diseases">Diseases</span> <span word="of">of</span> <span word="Agricultural">Agricultural</span> <span word="Plants">Plants</span></p><p> <span word="Plants">Plants</span>, <span word="like">like</span> <span word="animals">animals</span>, <span word="are">are</span> <span word="subject">subject</span> <span word="to">to</span> <span word="diseases">diseases</span> <span word="of">of</span> <span word="various">various</span> <span word="kinds">kinds</span>. <span word="It">It</span> <span word="has">has</span> <span word="been">been</span> <span word="estimated">estimated</span> <span word="that">that</span> <span word="some">some</span> 30,000 <span word="different">different</span> <span word="diseases">diseases</span> <span word="attack">attack</span> <span word="out">out</span> <span word="economic">economic</span> <span word="plants">plants</span>: <span word="forty">forty</span> <span word="are">are</span> <span word="known">known</span> <span word="to">to</span> <span word="attack">attack</span> <span word="corn">corn</span>, <span word="and">and</span> <span word="about">about</span> <span word="as">as</span> <span word="many">many</span> <span word="attack">attack</span> <span word="wheat">wheat</span>. <span word="The">The</span> <span word="results">results</span> <span word="of">of</span> <span word="unchecked">unchecked</span> <span word="plant">plant</span> <span word="disease">disease</span> <span word="are">are</span> <span word="all">all</span> <span word="too">too</span> <span word="obvious">obvious</span> <span word="in">in</span> <span word="countries">countries</span> <span word="which">which</span> <span word="have">have</span> <span word="marginal">marginal</span> <span word="food">food</span> <span word="supplies">supplies</span>. <span word="The">The</span> <span word="problem">problem</span> <span word="will">will</span> <span word="soon">soon</span> <span word="be">be</span> <span word="more">more</span> <span word="widespread">widespread</span> <span word="as">as</span> <span word="the">the</span> <span word="population">population</span> <span word="of">of</span> <span word="the">the</span> <span word="world">world</span> <span word="increases">increases</span> <span word="at">at</span> <span word="its">its</span> <span word="frightening">frightening</span> <span word="rate">rate</span>. <span word="Even">Even</span> <span word="in">in</span> <span word="countries">countries</span> <span word="which">which</span> <span word="are">are</span> <span word="now">now</span> <span word="amply">amply</span> <span word="fed">fed</span> <span word="by">by</span> <span word="their">their</span> <span word="agricultural">agricultural</span> <span word="products">products</span> <span word="there">there</span> <span word="could">could</span> <span word="soon">soon</span> <span word="be">be</span> <span word="critical">critical</span> <span word="food">food</span> <span word="shortages">shortages</span>. <span word="It">It</span> <span word="is">is</span> <span word="easy">easy</span> <span word="to">to</span> <span word="imagine">imagine</span> <span word="the">the</span> <span word="consequences">consequences</span> <span word="of">of</span> <span word="some">some</span> <span word="disastrous">disastrous</span> <span word="attack">attack</span> <span word="on">on</span> <span word="one">one</span> <span word="of">of</span> <span word="the">the</span> <span word="major">major</span> <span word="crops">crops</span>; <span word="the">the</span> <span word="resulting">resulting</span> <span word="famines">famines</span> <span word="could">could</span> <span word="kill">kill</span> <span word="millions">millions</span> <span word="of">of</span> <span word="people">people</span>, <span word="and">and</span> <span word="the">the</span> <span word="resulting">resulting</span> <span word="hardship">hardship</span> <span word="on">on</span> <span word="other">other</span> <span word="millions">millions</span> <span word="could">could</span> <span word="cause">cause</span> <span word="political">political</span> <span word="upheavals">upheavals</span> <span word="disastrous">disastrous</span> <span word="to">to</span> <span word="the">the</span> <span word="order">order</span> <span word="of">of</span> <span word="the">the</span> <span word="world">world</span>.</p><p> <span word="Some">Some</span> <span word="plants">plants</span> <span word="have">have</span> <span word="relative">relative</span> <span word="immunity">immunity</span> <span word="to">to</span> <span word="a">a</span> <span word="great">great</span> <span word="many">many</span> <span word="diseases">diseases</span>, <span word="while">while</span> <span word="others">others</span> <span word="have">have</span> <span word="a">a</span> <span word="susceptibility">susceptibility</span> <span word="to">to</span> <span word="them">them</span>. <span word="The">The</span> <span word="tolerance">tolerance</span> <span word="of">of</span> <span word="a">a</span> <span word="particular">particular</span> <span word="plant">plant</span> <span word="changes">changes</span> <span word="as">as</span> <span word="the">the</span> <span word="growing">growing</span> <span word="conditions">conditions</span> <span word="change">change</span>. <span word="A">A</span> <span word="blight">blight</span> <span word="may">may</span> <span word="be">be</span> <span word="but">but</span> <span word="a">a</span> <span word="local">local</span> <span word="infection">infection</span> <span word="easily">easily</span> <span word="controlled">controlled</span>, <span word="on">on</span> <span word="the">the</span> <span word="other">other</span> <span word="hand">hand</span> <span word="it">it</span> <span word="can">can</span> <span word="attack">attack</span> <span word="particular">particular</span> <span word="plants">plants</span> <span word="in">in</span> <span word="a">a</span> <span word="whole">whole</span> <span word="region">region</span> <span word="or">or</span> <span word="nation">nation</span>. <span word="An">An</span> <span word="example">example</span> <span word="is">is</span> <span word="the">the</span> <span word="blight">blight</span> <span word="which">which</span> <span word="killed">killed</span> <span word="virtually">virtually</span> <span word="every">every</span>. <span word="chestnut">chestnut</span> <span word="tree">tree</span> <span word="in">in</span> <span word="North">North</span> <span word="American">American</span>. <span word="Another">Another</span> <span word="is">is</span> <span word="the">the</span> <span word="famous">famous</span> <span word="potato">potato</span> <span word="blight">blight</span> <span word="in">in</span> <span word="Ireland">Ireland</span> <span word="in">in</span> <span word="the">the</span> <span word="last">last</span> <span word="century">century</span>. <span word="As">As</span> <span word="a">a</span> <span word="result">result</span> <span word="of">of</span> <span word="that">that</span>, <span word="it">it</span> <span word="was">was</span> <span word="estimated">estimated</span> <span word="that">that</span> <span word="one">one</span> <span word="million">million</span> <span word="people">people</span> <span word="died">died</span> <span word="of">of</span> <span word="starvation">starvation</span> <span word="and">and</span> <span word="related">related</span> <span word="aliments">aliments</span>.</p><p> <span word="Plant">Plant</span> <span word="pathologists">pathologists</span> <span word="have">have</span> <span word="made">made</span> <span word="remarkable">remarkable</span> <span word="strides">strides</span> <span word="in">in</span> <span word="identifying">identifying</span> <span word="the">the</span> <span word="pathogens">pathogens</span> <span word="of">of</span> <span word="the">the</span> <span word="various">various</span> <span word="diseases">diseases</span>. <span word="Bacteria">Bacteria</span> <span word="may">may</span> <span word="invade">invade</span> <span word="a">a</span> <span word="plant">plant</span> <span word="through">through</span> <span word="an">an</span> <span word="infestation">infestation</span> <span word="of">of</span> <span word="insect">insect</span> <span word="parasites">parasites</span> <span word="carrying">carrying</span> <span word="the">the</span> <span word="pathogen">pathogen</span>. <span word="A">A</span> <span word="plant">plant</span> <span word="can">can</span> <span word="also">also</span> <span word="be">be</span> <span word="inoculated">inoculated</span> <span word="by">by</span> <span word="man">man</span>. <span word="Other">Other</span> <span word="diseases">diseases</span> <span word="might">might</span> <span word="be">be</span> <span word="caused">caused</span> <span word="by">by</span> <span word="fungus">fungus</span> <span word="which">which</span> <span word="attacks">attacks</span> <span word="the">the</span> <span word="plant">plant</span> <span word="in">in</span> <span word="the">the</span> <span word="form">form</span> <span word="of">of</span> <span word="a">a</span> <span word="mold">mold</span> <span word="or">or</span> <span word="smut">smut</span> <span word="or">or</span> <span word="rust">rust</span>. <span word="Frequently">Frequently</span> <span word="such">such</span> <span word="a">a</span> <span word="primary">primary</span> <span word="infection">infection</span> <span word="will">will</span> <span word="weaken">weaken</span> <span word="the">the</span> <span word="plant">plant</span> <span word="so">so</span> <span word="that">that</span> <span word="a">a</span> <span word="secondary">secondary</span> <span word="infection">infection</span> <span word="may">may</span> <span word="result">result</span> <span word="from">from</span> <span word="its">its</span> <span word="lack">lack</span> <span word="of">of</span> <span word="tolerance">tolerance</span>. <span word="The">The</span> <span word="symptoms">symptoms</span> <span word="shown">shown</span> <span word="may">may</span> <span word="cause">cause</span> <span word="an">an</span> <span word="error">error</span> <span word="in">in</span> <span word="diagnosis">diagnosis</span>, <span word="so">so</span> <span word="that">that</span> <span word="treatment">treatment</span> <span word="may">may</span> <span word="be">be</span> <span word="directed">directed</span> <span word="toward">toward</span> <span word="bacteria">bacteria</span> <span word="which">which</span> <span word="could">could</span> <span word="be">be</span> <span word="the">the</span> <span word="result">result</span> <span word="of">of</span> <span word="a">a</span> <span word="susceptibility">susceptibility</span> <span word="caused">caused</span> <span word="by">by</span> <span word="a">a</span> <span word="primary">primary</span> <span word="virus">virus</span> <span word="infection">infection</span>.</p>
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