考研英语作文之美文范例沙漠植物
<p> <span word="Plantsin">Plantsin</span> <span word="the">the</span> <span word="Deserts">Deserts</span></p><p> <span word="Some">Some</span> <span word="cacti">cacti</span>, <span word="like">like</span> <span word="the">the</span> <span word="saguaro">saguaro</span>, <span word="grow">grow</span> <span word="to">to</span> <span word="tree">tree</span> <span word="size">size</span>, <span word="but">but</span> <span word="true">true</span> <span word="trees">trees</span> <span word="needmore">needmore</span> <span word="moisture">moisture</span> <span word="than">than</span> <span word="most">most</span> <span word="desert">desert</span> <span word="environments">environments</span> <span word="can">can</span> <span word="supply">supply</span>, <span word="so">so</span> <span word="they">they</span> <span word="are">are</span> <span word="scarce">scarce</span> <span word="ondeserts">ondeserts</span>. <span word="Close">Close</span> <span word="to">to</span> <span word="streambeds">streambeds</span>, <span word="cottonwoods">cottonwoods</span> <span word="can">can</span> <span word="sometimes">sometimes</span> <span word="be">be</span> <span word="found">found</span>. <span word="Though">Though</span> <span word="thesestreams">thesestreams</span> <span word="are">are</span> <span word="dry">dry</span> <span word="most">most</span> <span word="of">of</span> <span word="the">the</span> <span word="year">year</span>, <span word="water">water</span> <span word="flows">flows</span> <span word="there">there</span> <span word="longest">longest</span> <span word="and">and</span> <span word="is">is</span> <span word="usuallyavailable">usuallyavailable</span> <span word="fairly">fairly</span> <span word="close">close</span> <span word="to">to</span> <span word="the">the</span> <span word="surface">surface</span>. <span word="Elsewhere">Elsewhere</span>, <span word="trees">trees</span> <span word="must">must</span> <span word="send">send</span> <span word="taproots">taproots</span> <span word="deepinto">deepinto</span> <span word="the">the</span> <span word="hard">hard</span> <span word="baked">baked</span> <span word="desert">desert</span> <span word="soil">soil</span> <span word="to">to</span> <span word="draw">draw</span> <span word="on">on</span> <span word="underground">underground</span> <span word="water">water</span>. <span word="Perhaps">Perhaps</span> <span word="themost">themost</span> <span word="widespread">widespread</span> <span word="family">family</span> <span word="of">of</span> <span word="trees">trees</span> <span word="on">on</span> <span word="the">the</span> <span word="worlds">worlds</span> <span word="deserts">deserts</span> <span word="is">is</span> <span word="the">the</span> <span word="acacia">acacia</span>, <span word="whosetaproots">whosetaproots</span> <span word="drill">drill</span> <span word="down">down</span> <span word="as">as</span> <span word="far">far</span> <span word="as">as</span> 25 <span word="feet">feet</span>. <span word="The">The</span> <span word="mesquite">mesquite</span> <span word="common">common</span> <span word="onNorth">onNorth</span> <span word="American">American</span> <span word="deserts">deserts</span> <span word="in">in</span> <span word="both">both</span> <span word="tree">tree</span> <span word="and">and</span> <span word="shrub">shrub</span> <span word="forms">forms</span>, <span word="does">does</span> <span word="not">not</span> <span word="begin">begin</span> <span word="to">to</span> <span word="growabove">growabove</span> <span word="ground">ground</span> <span word="until">until</span> <span word="its">its</span> <span word="root">root</span> <span word="system">system</span> <span word="is">is</span> <span word="completely">completely</span> <span word="developed">developed</span>, <span word="ensuring">ensuring</span> <span word="the">the</span> <span word="planta">planta</span> <span word="supply">supply</span> <span word="of">of</span> <span word="moisture">moisture</span>. <span word="The">The</span> <span word="roots">roots</span> <span word="of">of</span> <span word="shrubs">shrubs</span> <span word="and">and</span> <span word="trees">trees</span> <span word="help">help</span> <span word="to">to</span> <span word="hold">hold</span> <span word="the">the</span> <span word="desertsoil">desertsoil</span> <span word="in">in</span> <span word="place">place</span>. <span word="Their">Their</span> <span word="stalks">stalks</span> <span word="and">and</span> <span word="branches">branches</span> <span word="also">also</span> <span word="act">act</span> <span word="as">as</span> <span word="screens">screens</span> <span word="to">to</span> <span word="keep">keep</span> <span word="the">the</span> <span word="windfrom">windfrom</span> <span word="sweeping">sweeping</span> <span word="great">great</span> <span word="drifts">drifts</span> <span word="of">of</span> <span word="sand">sand</span> <span word="along">along</span> <span word="the">the</span> <span word="surface">surface</span>. <span word="These">These</span> <span word="services">services</span> <span word="are">are</span> <span word="vitalif">vitalif</span> <span word="a">a</span> <span word="desert">desert</span> <span word="is">is</span> <span word="to">to</span> <span word="support">support</span> <span word="life">life</span>. <span word="Scientists">Scientists</span> <span word="estimate">estimate</span> <span word="that">that</span> <span word="a">a</span> <span word="desert">desert</span> <span word="needsyear">needsyear</span> <span word="round">round</span> <span word="plant">plant</span> <span word="cover">cover</span> <span word="over">over</span> 20 <span word="to">to</span> 40 <span word="percent">percent</span> <span word="of">of</span> <span word="its">its</span> <span word="surface">surface</span>. <span word="If">If</span> <span word="shrubs">shrubs</span> <span word="aretoo">aretoo</span> <span word="far">far</span> <span word="apart">apart</span> - <span word="separated">separated</span> <span word="by">by</span> <span word="a">a</span> <span word="distance">distance</span> <span word="greater">greater</span> <span word="than">than</span> <span word="five">five</span> <span word="times">times</span> <span word="their">their</span> <span word="height">height</span> -<span word="soil">soil</span> <span word="around">around</span> <span word="them">them</span> <span word="is">is</span> <span word="likely">likely</span> <span word="to">to</span> <span word="blow">blow</span> <span word="away">away</span>. <span word="Without">Without</span> <span word="the">the</span> <span word="shelter">shelter</span> <span word="of">of</span> <span word="establishedshrubs">establishedshrubs</span>, <span word="new">new</span> <span word="seedlings">seedlings</span> <span word="will">will</span> <span word="have">have</span> <span word="difficulty">difficulty</span> <span word="in">in</span> <span word="getting">getting</span> <span word="a">a</span> <span word="start">start</span>. <span word="On">On</span> <span word="the">the</span> <span word="otherhand">otherhand</span>, <span word="plants">plants</span> <span word="that">that</span> <span word="are">are</span> <span word="too">too</span> <span word="close">close</span> <span word="together">together</span> <span word="may">may</span> <span word="compete">compete</span> <span word="for">for</span> <span word="underground">underground</span> <span word="moisture">moisture</span>.<span word="To">To</span> <span word="protect">protect</span> <span word="themselves">themselves</span> <span word="from">from</span> <span word="this">this</span> <span word="competition">competition</span> <span word="some">some</span> <span word="shrubs">shrubs</span> <span word="give">give</span> <span word="off">off</span> <span word="a">a</span> <span word="substancethat">substancethat</span> <span word="kills">kills</span> <span word="young">young</span> <span word="plants">plants</span> <span word="that">that</span> <span word="sprout">sprout</span> <span word="too">too</span> <span word="close">close</span> <span word="to">to</span> <span word="them">them</span>. <span word="In">In</span> <span word="addition">addition</span> <span word="to">to</span> <span word="a">a</span> <span word="fewvarieties">fewvarieties</span> <span word="of">of</span> <span word="trees">trees</span> <span word="and">and</span> <span word="tough">tough</span> <span word="shrubs">shrubs</span>, <span word="most">most</span> <span word="deserts">deserts</span> <span word="have">have</span> <span word="grasses">grasses</span>, <span word="herbs">herbs</span>, <span word="andother">andother</span> <span word="annual">annual</span> <span word="plants">plants</span>. <span word="These">These</span> <span word="do">do</span> <span word="not">not</span> <span word="compete">compete</span> <span word="for">for</span> <span word="moisture">moisture</span> <span word="with">with</span> <span word="the">the</span> <span word="longer">longer</span> <span word="lived">lived</span> <span word="growth">growth</span>.<span word="They">They</span> <span word="spring">spring</span> <span word="up">up</span> <span word="quickly">quickly</span> <span word="after">after</span> <span word="rains">rains</span>, <span word="when">when</span> <span word="the">the</span> <span word="surface">surface</span> <span word="is">is</span> <span word="moist">moist</span>. <span word="Then">Then</span>, <span word="for">for</span> <span word="abrief">abrief</span> <span word="time">time</span>, <span word="the">the</span> <span word="desert">desert</span> <span word="can">can</span> <span word="be">be</span> <span word="literally">literally</span> <span word="carpeted">carpeted</span> <span word="with">with</span> <span word="color">color</span>. <span word="Almost">Almost</span> <span word="as">as</span> <span word="quicklyas">quicklyas</span> <span word="they">they</span> <span word="appeared">appeared</span>, <span word="these">these</span> <span word="small">small</span> <span word="plants">plants</span> <span word="die">die</span> <span word="away">away</span>. <span word="But">But</span> <span word="they">they</span> <span word="have">have</span> <span word="developed">developed</span> <span word="specialways">specialways</span> <span word="of">of</span> <span word="ensuring">ensuring</span> <span word="the">the</span> <span word="life">life</span> <span word="of">of</span> <span word="another">another</span> <span word="generation">generation</span> <span word="when">when</span> <span word="rains">rains</span> <span word="come">come</span> <span word="again">again</span>.</p>
页:
[1]