福建省长泰一中2017届高考英语一轮复习单元精练：人教版选修7 Unit 5
<p> 选修7</p><p> <span word="Unit">Unit</span> 5</p><p> <span word="Travelling">Travelling</span></p><p> <span word="abroad">abroad</span></p><p> 能力演练</p><p> 一、语法填空</p><p> <span word="If">If</span> <span word="the">the</span> <span word="population">population</span> <span word="of">of</span> <span word="the">the</span> <span word="Earth">Earth</span> <span word="keeps">keeps</span> <span word="on">on</span></p><p> 1</p><p> (<span word="increase">increase</span>)<span word="at">at</span> <span word="its">its</span> <span word="present">present</span> <span word="rate">rate</span>,<span word="there">there</span> <span word="will">will</span></p><p> 2</p><p> (<span word="event">event</span>)<span word="not">not</span> <span word="be">be</span> <span word="enough">enough</span> <span word="resources">resources</span> <span word="left">left</span> <span word="to">to</span> <span word="support">support</span> <span word="life">life</span> <span word="on">on</span> <span word="the">the</span> <span word="planet">planet</span>.<span word="By">By</span> <span word="the">the</span> <span word="middle">middle</span> <span word="of">of</span> <span word="the">the</span> 21<span word="st">st</span> <span word="century">century</span>,<span word="if">if</span> <span word="present">present</span> <span word="trends">trends</span> <span word="continue">continue</span>,<span word="we">we</span></p><p> 3</p><p> (<span word="use">use</span>)<span word="up">up</span> <span word="all">all</span> <span word="the">the</span> <span word="oil">oil</span> <span word="that">that</span> <span word="drive">drive</span> <span word="our">our</span> <span word="cars">cars</span>,<span word="for">for</span> <span word="example">example</span>.<span word="Even">Even</span> <span word="if">if</span> <span word="scientists">scientists</span> <span word="develop">develop</span> <span word="new">new</span> <span word="ways">ways</span> <span word="of">of</span> <span word="feeding">feeding</span> <span word="the">the</span> <span word="human">human</span> <span word="race">race</span>,<span word="the">the</span> <span word="crowded">crowded</span> <span word="conditions">conditions</span> <span word="on">on</span> <span word="Earth">Earth</span> <span word="will">will</span> <span word="make">make</span> <span word="it">it</span></p><p> 4</p><p> (<span word="necessity">necessity</span>)<span word="for">for</span> <span word="us">us</span> <span word="to">to</span> <span word="look">look</span> <span word="for">for</span> <span word="somewhere">somewhere</span> <span word="else">else</span>.<span word="But">But</span></p><p> 5</p><p> <span word="of">of</span> <span word="the">the</span> <span word="other">other</span> <span word="planets">planets</span> <span word="in">in</span> <span word="our">our</span> <span word="solar">solar</span> <span word="system">system</span> <span word="are">are</span> <span word="capable">capable</span> <span word="of">of</span> <span word="supporting">supporting</span> <span word="life">life</span> <span word="at">at</span> <span word="present">present</span>.<span word="One">One</span> <span word="possible">possible</span> <span word="solution">solution</span> <span word="to">to</span> <span word="the">the</span> <span word="problem">problem</span>,</p><p> 6</p><p> ,<span word="hasrecentlybeen">hasrecentlybeen</span> <span word="suggested">suggested</span> <span word="by">by</span> <span word="an">an</span> <span word="American">American</span> <span word="scientist">scientist</span>,<span word="Professor">Professor</span> <span word="Carl">Carl</span> <span word="Sagan">Sagan</span>.<span word="Sagan">Sagan</span> <span word="believes">believes</span> <span word="that">that</span></p><p> 7</p><p> <span word="the">the</span> <span word="Earth">Earth</span>,<span word="s">s</span> <span word="resources">resources</span> <span word="are">are</span> <span word="completely">completely</span></p><p> 8</p><p> (<span word="exhaust">exhaust</span>),<span word="it">it</span> <span word="will">will</span> <span word="be">be</span> <span word="possible">possible</span> <span word="to">to</span> <span word="change">change</span> <span word="the">the</span> <span word="atmosphere">atmosphere</span> <span word="of">of</span> <span word="Venus">Venus</span> <span word="and">and</span></p><p> 9</p><p> <span word="create">create</span> <span word="a">a</span> <span word="new">new</span> <span word="world">world</span> <span word="almost">almost</span> <span word="as">as</span> <span word="large">large</span> <span word="as">as</span> <span word="Earth">Earth</span> <span word="itself">itself</span>.<span word="Something">Something</span> <span word="is">is</span> <span word="difficult">difficult</span>.<span word="Venus">Venus</span> <span word="is">is</span> <span word="much">much</span> <span word="hotter">hotter</span> <span word="than">than</span> <span word="the">the</span> <span word="Earth">Earth</span>.</p><p> 10</p><p> ,<span word="there">there</span> <span word="is">is</span> <span word="only">only</span> <span word="a">a</span> <span word="tinyamountof">tinyamountof</span> <span word="water">water</span> <span word="there">there</span>.</p>
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