英语六级阅读备考练习题及答案（9）
<p> <span word="Water">Water</span> <span word="problems">problems</span> <span word="in">in</span> <span word="the">the</span> <span word="future">future</span> <span word="will">will</span> <span word="become">become</span> <span word="more">more</span> <span word="intense">intense</span> <span word="and">and</span> <span word="more">more</span> <span word="complex">complex</span>. <span word="Our">Our</span> <span word="increasing">increasing</span> <span word="population">population</span> <span word="will">will</span> <span word="tremendously">tremendously</span> <span word="increase">increase</span> <span word="urban">urban</span> <span word="wastes">wastes</span>, <span word="primarily">primarily</span> <span word="sewage">sewage</span>. <span word="On">On</span> <span word="the">the</span> <span word="other">other</span> <span word="hand">hand</span>, <span word="increasing">increasing</span> <span word="demands">demands</span> <span word="for">for</span> <span word="water">water</span> <span word="will">will</span> <span word="decrease">decrease</span> <span word="substantially">substantially</span> <span word="the">the</span> <span word="amount">amount</span> <span word="of">of</span> <span word="water">water</span> <span word="available">available</span> <span word="for">for</span> <span word="diluting">diluting</span> <span word="wastes">wastes</span>. <span word="Rapidly">Rapidly</span> <span word="expanding">expanding</span> <span word="industries">industries</span> <span word="which">which</span> <span word="involve">involve</span> <span word="more">more</span> <span word="and">and</span> <span word="more">more</span> <span word="complex">complex</span> <span word="chemical">chemical</span> <span word="processes">processes</span> <span word="will">will</span> <span word="produce">produce</span> <span word="large">large</span> <span word="volumes">volumes</span> <span word="of">of</span> <span word="liquid">liquid</span> <span word="wastes">wastes</span>, <span word="and">and</span> <span word="many">many</span> <span word="of">of</span> <span word="these">these</span> <span word="will">will</span> <span word="contain">contain</span> <span word="chemicals">chemicals</span> <span word="which">which</span> <span word="are">are</span> <span word="poisonous">poisonous</span>. <span word="To">To</span> <span word="feed">feed</span> <span word="our">our</span> <span word="rapidly">rapidly</span> <span word="expanding">expanding</span> <span word="population">population</span>, <span word="agriculture">agriculture</span> <span word="will">will</span> <span word="have">have</span> <span word="to">to</span> <span word="be">be</span> <span word="intensified">intensified</span>. <span word="This">This</span> <span word="will">will</span> <span word="involve">involve</span> <span word="ever">ever</span>-<span word="increasing">increasing</span> <span word="quantities">quantities</span> <span word="of">of</span> <span word="agriculture">agriculture</span> <span word="chemicals">chemicals</span>. <span word="From">From</span> <span word="this">this</span>, <span word="it">it</span> <span word="is">is</span> <span word="apparent">apparent</span> <span word="that">that</span> <span word="drastic">drastic</span> <span word="steps">steps</span> <span word="must">must</span> <span word="be">be</span> <span word="taken">taken</span> <span word="immediately">immediately</span> <span word="to">to</span> <span word="develop">develop</span> <span word="corrective">corrective</span> <span word="measures">measures</span> <span word="for">for</span> <span word="the">the</span> <span word="pollution">pollution</span> <span word="problem">problem</span>.</p><p> <span word="There">There</span> <span word="are">are</span> <span word="two">two</span> <span word="ways">ways</span> <span word="by">by</span> <span word="which">which</span> <span word="this">this</span> <span word="pollution">pollution</span> <span word="problem">problem</span> <span word="can">can</span> <span word="be">be</span> <span word="lessened">lessened</span>. <span word="The">The</span> <span word="first">first</span> <span word="relates">relates</span> <span word="to">to</span> <span word="the">the</span> <span word="treatment">treatment</span> <span word="of">of</span> <span word="wastes">wastes</span> <span word="to">to</span> <span word="decrease">decrease</span> <span word="their">their</span> <span word="pollution">pollution</span> <span word="hazard">hazard</span>. <span word="This">This</span> <span word="involves">involves</span> <span word="the">the</span> <span word="processing">processing</span> <span word="of">of</span> <span word="solid">solid</span> <span word="wastes">wastes</span> <span word="prior">prior</span> <span word="to">to</span> <span word="disposal">disposal</span> <span word="and">and</span> <span word="the">the</span> <span word="treatment">treatment</span> <span word="of">of</span> <span word="liquid">liquid</span> <span word="wastes">wastes</span>, <span word="or">or</span> <span word="effluents">effluents</span> , <span word="to">to</span> <span word="permit">permit</span> <span word="the">the</span> <span word="reuse">reuse</span> <span word="of">of</span> <span word="the">the</span> <span word="water">water</span> <span word="or">or</span> <span word="best">best</span> <span word="reduce">reduce</span> <span word="pollution">pollution</span> <span word="upon">upon</span> <span word="final">final</span> <span word="disposal">disposal</span>.</p><p> <span word="A">A</span> <span word="second">second</span> <span word="approach">approach</span> <span word="is">is</span> <span word="to">to</span> <span word="develop">develop</span> <span word="an">an</span> <span word="economic">economic</span> <span word="use">use</span> <span word="for">for</span> <span word="all">all</span> <span word="or">or</span> <span word="a">a</span> <span word="part">part</span> <span word="of">of</span> <span word="the">the</span> <span word="wastes">wastes</span>. <span word="Farm">Farm</span> <span word="manure">manure</span> <span word="is">is</span> <span word="spread">spread</span> <span word="in">in</span> <span word="fields">fields</span> <span word="as">as</span> <span word="a">a</span> <span word="nutrient">nutrient</span> <span word="or">or</span> <span word="organic">organic</span> <span word="supplement">supplement</span>. <span word="Effluents">Effluents</span> <span word="from">from</span> <span word="sewage">sewage</span> <span word="disposal">disposal</span> <span word="plants">plants</span> <span word="are">are</span> <span word="used">used</span> <span word="in">in</span> <span word="some">some</span> <span word="areas">areas</span> <span word="both">both</span> <span word="for">for</span> <span word="irrigation">irrigation</span> <span word="and">and</span> <span word="for">for</span> <span word="the">the</span> <span word="nutrients">nutrients</span> <span word="contained">contained</span>. <span word="Effluents">Effluents</span> <span word="from">from</span> <span word="other">other</span> <span word="processing">processing</span> <span word="plants">plants</span> <span word="may">may</span> <span word="also">also</span> <span word="be">be</span> <span word="used">used</span> <span word="as">as</span> <span word="a">a</span> <span word="supplemental">supplemental</span> <span word="source">source</span> <span word="of">of</span> <span word="water">water</span>. <span word="Many">Many</span> <span word="industries">industries</span>, <span word="such">such</span> <span word="as">as</span> <span word="meat">meat</span> <span word="and">and</span> <span word="poultry">poultry</span> <span word="processing">processing</span> <span word="plants">plants</span>, <span word="are">are</span> <span word="currently">currently</span> <span word="converting">converting</span> <span word="former">former</span> <span word="waste">waste</span> <span word="production">production</span> <span word="into">into</span> <span word="marketable">marketable</span> <span word="byproducts">byproducts</span>. <span word="Other">Other</span> <span word="industries">industries</span> <span word="have">have</span> <span word="potential">potential</span> <span word="economic">economic</span> <span word="uses">uses</span> <span word="for">for</span> <span word="their">their</span> <span word="waste">waste</span> <span word="products">products</span>.</p>
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