2017届高考英语一轮复习跟踪检测：必修2 Module 1 Our Body and Healthy Habits（外研版）
<p> <span word="Module">Module</span> 1 <span word="Our">Our</span> <span word="Body">Body</span> <span word="and">and</span> <span word="Healthy">Healthy</span> <span word="Habits">Habits</span></p><p> 阅读理解提速练——练速度</p><p> (限时：20分钟)</p><p> <span word="A">A</span></p><p> (2016·衡水一中高考模拟)<span word="It">It</span> <span word="is">is</span> 7 <span word="am">am</span> <span word="and">and</span> <span word="the">the</span> <span word="alarm">alarm</span> <span word="is">is</span> <span word="going">going</span> <span word="off">off</span>. <span word="You">You</span> <span word="know">know</span> <span word="you">you</span> <span word="have">have</span> <span word="to">to</span> <span word="be">be</span> <span word="out">out</span> <span word="of">of</span> <span word="bed">bed</span> <span word="to">to</span> <span word="catch">catch</span> <span word="the">the</span> <span word="bus">bus</span>. <span word="But">But</span> <span word="the">the</span> <span word="urge">urge</span> <span word="to">to</span> <span word="bury">bury</span> <span word="yourself">yourself</span> <span word="in">in</span> <span word="the">the</span> <span word="bed">bed</span> <span word="is">is</span> <span word="ever">ever</span> <span word="so">so</span> <span word="strong">strong</span>.</p><p> <span word="Sounds">Sounds</span> <span word="familiar">familiar</span>? <span word="Why">Why</span> <span word="is">is</span> <span word="it">it</span> <span word="that">that</span> <span word="teens">teens</span> <span word="find">find</span> <span word="it">it</span> <span word="difficult">difficult</span> <span word="to">to</span> <span word="get">get</span> <span word="themselves">themselves</span> <span word="out">out</span> <span word="of">of</span> <span word="bed">bed</span> <span word="in">in</span> <span word="time">time</span> <span word="every">every</span> <span word="morning">morning</span> <span word="or">or</span> <span word="stay">stay</span> <span word="sharp">sharp</span> <span word="and">and</span> <span word="focused">focused</span> <span word="during">during</span> <span word="the">the</span> <span word="first">first</span> <span word="couple">couple</span> <span word="of">of</span> <span word="hours">hours</span> <span word="of">of</span> <span word="school">school</span>?</p><p> <span word="During">During</span> <span word="adolescence">adolescence</span>, <span word="the">the</span> <span word="body">body</span> <span word="goes">goes</span> <span word="through">through</span> <span word="many">many</span> <span word="changes">changes</span> <span word="and">and</span> <span word="these">these</span> <span word="include">include</span> <span word="a">a</span> <span word="shift">shift</span> <span word="in">in</span> <span word="sleep">sleep</span> <span word="patterns">patterns</span>. <span word="Researchers">Researchers</span> <span word="from">from</span> <span word="MIT">MIT</span> <span word="have">have</span> <span word="been">been</span> <span word="tracking">tracking</span> <span word="the">the</span> <span word="body">body</span>'<span word="s">s</span> <span word="need">need</span> <span word="for">for</span> <span word="sleep">sleep</span> <span word="in">in</span> <span word="teenagers">teenagers</span>. <span word="They">They</span> <span word="found">found</span> <span word="that">that</span> <span word="though">though</span> <span word="adolescents">adolescents</span> <span word="need">need</span> <span word="as">as</span> <span word="much">much</span> <span word="as">as</span> 9.5 <span word="hours">hours</span> <span word="of">of</span> <span word="sleep">sleep</span> <span word="a">a</span> <span word="day">day</span>, <span word="they">they</span> <span word="get">get</span> <span word="to">to</span> <span word="bed">bed</span> <span word="later">later</span> <span word="and">and</span> <span word="later">later</span> <span word="with">with</span> <span word="each">each</span> <span word="passing">passing</span> <span word="year">year</span>. <span word="In">In</span> <span word="fact">fact</span>, <span word="the">the</span> <span word="sleep">sleep</span> <span word="cycle">cycle</span> <span word="shifts">shifts</span> <span word="later">later</span> <span word="by">by</span> <span word="as">as</span> <span word="much">much</span> <span word="as">as</span> 12 <span word="to">to</span> 18 <span word="minutes">minutes</span> <span word="each">each</span> <span word="year">year</span> <span word="between">between</span> <span word="the">the</span> <span word="ages">ages</span> <span word="of">of</span> 10 <span word="and">and</span> 20! <span word="So">So</span> <span word="by">by</span> <span word="the">the</span> <span word="time">time</span> <span word="a">a</span> 10<span word="year">year</span><span word="old">old</span> <span word="who">who</span> <span word="sleeps">sleeps</span> <span word="at">at</span> 8 <span word="pm">pm</span> <span word="grows">grows</span> <span word="to">to</span> <span word="be">be</span> 17 <span word="or">or</span> 18, <span word="his">his</span> <span word="body">body</span> <span word="naturally">naturally</span> <span word="wants">wants</span> <span word="to">to</span> <span word="stay">stay</span> <span word="up">up</span> <span word="till">till</span> 10：30 <span word="pm">pm</span> <span word="or">or</span> 11 <span word="pm">pm</span>.</p><p> <span word="A">A</span>ccording to researchers, this is because of a hormone called melatonin (褪黑激素) that is secreted (分泌) by the pineal gland — a tiny structure deep inside the brain. Melatonin regulates the body's natural daynight rhythms. It causes a person to become sleepy by lowering his body's core temperature. In teens, melatonin is secreted much later in the evening and continues to increase throughout the night. This makes it difficult for teens to fall asleep earlier as they did in their younger years. Likewise, the effect of melatonin continues until much later in the morning, making it hard for them to wake up early.</p>
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