2016届高考英语人教版一轮复习：课时作业1
<p> 课时作业1 <span word="Friendship">Friendship</span></p><p> Ⅰ.阅读理解</p><p> (2017·江苏省南通中学测试)</p><p> <span word="Why">Why</span> <span word="Are">Are</span> <span word="Pig">Pig</span> <span word="Farmers">Farmers</span> <span word="Still">Still</span> <span word="Using">Using</span> <span word="Growth">Growth</span><span word="Promoting">Promoting</span> <span word="Drugs">Drugs</span>?</p><p> <span word="It">It</span>'<span word="s">s</span> <span word="one">one</span> <span word="of">of</span> <span word="the">the</span> <span word="most">most</span> <span word="controversial">controversial</span> <span word="practices">practices</span> <span word="in">in</span> <span word="agriculture">agriculture</span>: <span word="feeding">feeding</span> <span word="small">small</span> <span word="amounts">amounts</span> <span word="of">of</span> <span word="antibiotics">antibiotics</span> <span word="to">to</span> <span word="animals">animals</span> <span word="in">in</span> <span word="order">order</span> <span word="to">to</span> <span word="make">make</span> <span word="them">them</span> <span word="grow">grow</span> <span word="faster">faster</span>. <span word="But">But</span> <span word="what">what</span> <span word="if">if</span> <span word="the">the</span> <span word="drugs">drugs</span> <span word="don">don</span>'<span word="t">t</span> <span word="even">even</span> <span word="work">work</span> <span word="very">very</span> <span word="well">well</span>? <span word="There">There</span>'<span word="s">s</span> <span word="some">some</span> <span word="good">good</span> <span word="evidence">evidence</span> <span word="that">that</span> <span word="they">they</span> <span word="don">don</span>'<span word="t">t</span>, <span word="at">at</span> <span word="least">least</span> <span word="in">in</span> <span word="pigs">pigs</span>. <span word="They">They</span> <span word="used">used</span> <span word="to">to</span> <span word="deliver">deliver</span> <span word="a">a</span> <span word="boost">boost</span> <span word="in">in</span> <span word="growth">growth</span>, <span word="but">but</span> <span word="that">that</span> <span word="effect">effect</span> <span word="has">has</span> <span word="disappeared">disappeared</span> <span word="in">in</span> <span word="recent">recent</span> <span word="years">years</span> <span word="or">or</span> <span word="declined">declined</span> <span word="greatly">greatly</span>. <span word="The">The</span> <span word="reason">reason</span> <span word="for">for</span> <span word="this">this</span> <span word="is">is</span> <span word="interesting">interesting</span> <span word="and">and</span> <span word="even">even</span> <span word="paradoxical">paradoxical</span>. <span word="Researchers">Researchers</span> <span word="think">think</span> <span word="the">the</span> <span word="antibiotics">antibiotics</span> <span word="used">used</span> <span word="to">to</span> <span word="work">work</span> <span word="by">by</span> <span word="suppressing">suppressing</span> <span word="low">low</span><span word="grade">grade</span> <span word="infections">infections</span>. <span word="In">In</span> <span word="recent">recent</span> <span word="years">years</span>, <span word="however">however</span>, <span word="pork">pork</span> <span word="producers">producers</span> <span word="found">found</span> <span word="other">other</span> <span word="ways">ways</span> <span word="to">to</span> <span word="accomplish">accomplish</span> <span word="the">the</span> <span word="same">same</span> <span word="thing">thing</span> <span word="through">through</span> <span word="improved">improved</span> <span word="hygiene">hygiene</span>(卫生). <span word="As">As</span> <span word="a">a</span> <span word="result">result</span>, <span word="the">the</span> <span word="drugs">drugs</span> <span word="have">have</span> <span word="become">become</span> <span word="largely">largely</span> <span word="superfluous">superfluous</span>—<span word="yet">yet</span> <span word="many">many</span> <span word="farmers">farmers</span> <span word="still">still</span> <span word="use">use</span> <span word="them">them</span>.</p><p> <span word="To">To</span> <span word="understand">understand</span> <span word="how">how</span> <span word="this">this</span> <span word="happened">happened</span>, <span word="you">you</span> <span word="have">have</span> <span word="to">to</span> <span word="step">step</span> <span word="back">back</span> <span word="in">in</span> <span word="time">time</span>, <span word="says">says</span> <span word="Steve">Steve</span> <span word="Dritz">Dritz</span>, <span word="a">a</span> <span word="specialist">specialist</span> <span word="in">in</span> <span word="pig">pig</span> <span word="nutrition">nutrition</span> <span word="at">at</span> <span word="Kansas">Kansas</span> <span word="State">State</span> <span word="University">University</span>. <span word="Sixty">Sixty</span> <span word="years">years</span> <span word="ago">ago</span>, <span word="when">when</span> <span word="antibiotics">antibiotics</span> <span word="were">were</span> <span word="new">new</span>, “<span word="people">people</span> <span word="started">started</span> <span word="treating">treating</span> <span word="animals">animals</span>, <span word="and">and</span> <span word="feeding">feeding</span> [<span word="the">the</span> <span word="antibiotics">antibiotics</span>], <span word="and">and</span> <span word="finding">finding</span> <span word="that">that</span> <span word="they">they</span> <span word="had">had</span> <span word="increased">increased</span> <span word="growth">growth</span> <span word="rates">rates</span> <span word="and">and</span> <span word="feed">feed</span> <span word="efficiencies">efficiencies</span>，” <span word="he">he</span> <span word="says">says</span>. <span word="Nursery">Nursery</span><span word="age">age</span> <span word="pigs">pigs</span>, <span word="for">for</span> <span word="instance">instance</span>, <span word="grew">grew</span> 12 <span word="to">to</span> 15 <span word="percent">percent</span> <span word="faster">faster</span> <span word="with">with</span> <span word="antibiotics">antibiotics</span>. <span word="The">The</span> <span word="animals">animals</span> <span word="also">also</span> <span word="needed">needed</span> <span word="less">less</span> <span word="feed">feed</span> <span word="to">to</span> <span word="reach">reach</span> <span word="full">full</span> <span word="weight">weight</span>. <span word="Other">Other</span> <span word="studies">studies</span> <span word="showed">showed</span> <span word="similar">similar</span> <span word="results">results</span> <span word="in">in</span> <span word="chickens">chickens</span> <span word="and">and</span> <span word="cattle">cattle</span>. <span word="In">In</span> <span word="the">the</span> 1980<span word="s">s</span>, <span word="a">a</span> <span word="new">new</span> <span word="set">set</span> <span word="of">of</span> <span word="studies">studies</span> <span word="found">found</span> <span word="similar">similar</span> <span word="effects">effects</span>. <span word="So">So</span> <span word="the">the</span> <span word="growth">growth</span><span word="promoting">promoting</span> <span word="effects">effects</span> <span word="of">of</span> <span word="antibiotics">antibiotics</span> <span word="became">became</span> <span word="standard">standard</span> <span word="practice">practice</span> <span word="among">among</span> <span word="meat">meat</span> <span word="producers">producers</span>. <span word="Fast">Fast</span> <span word="forward">forward</span> <span word="to">to</span> <span word="the">the</span> 1990<span word="s">s</span>. <span word="Dritz">Dritz</span> <span word="was">was</span> <span word="starting">starting</span> <span word="his">his</span> <span word="career">career</span> <span word="as">as</span> <span word="a">a</span> <span word="scientist">scientist</span> <span word="at">at</span> <span word="Kansas">Kansas</span> <span word="State">State</span> <span word="University">University</span>, <span word="and">and</span> <span word="pork">pork</span> <span word="production">production</span> <span word="was">was</span> <span word="changing">changing</span> <span word="dramatically">dramatically</span>.</p>
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