Directions:Inthissection,thereisapassagewithtenblanks.Youarerequiredtoselectonewordforeachblankfromalistofchoicesgiveninawordbankfollowingthepassage.Readthepassagethroughcarefullybeforemakingyourchoices.Eachchoiceinbankisidentifiedbyaletter.PleasemarkthecorrespondingletterforeachitemonAnswerSheet2withasinglelinethroughthecenter.Youmaynotuseanyofthewordsinthebankmorethanonce.
Questions47to56arebasedonthefollowingpassage.
PerhapslikemostAmericansyouhavesomeextrapoundsto___47___.Youmayevenhavetriedafaddietortwo,butfoundyourselfrightbackwhereyoustarted.Thekeytoweightlossisregular___48___activity.Andsurprisingly,youdon'thavetogiveupeatingormakethegymyoursecondhometoseelong-term,___49___effects.
Youbodyneedsacertainamountofenergytomaintainbasic___50___suchasbreathing,bloodcirculationanddigestion.Theenergyrequiredtokeepyourorgansfunctioningisreferredtoastherestingorbasalmetabolicrate.
Anytimeyouareactive,___51___energyisrequired.Itisobtainedfromglycogenandfatstoredintheblood,liver,andmuscles.Thekeytolosingweightistodrawonthefatratherthanonthecarbohydratereserves.
Whichofthetwoenergysourcesyouusedependsontheintensityand___52___ofyouractivity.Thehighertheintensity,themoreyourbodywillpullfromthestoredcarbohydrates.Thelowertheintensity,themoreyourbodywill___53___onfatasitsfuel.
Aerobicexerciseismost___54___forweightloss.Whenyouperformaerobicactivitiesyou___55___contractlargemusclegroupssuchasyourlegsandarms.Walking,running,rollerblading,swimming,dancing,andjumpingjacksareallformsofaerobicactivity.
Surprisingly,ifyouraerobicactivityislowtomoderatelyintenseandoflongduration,youwillburnmorefatthanifyouhad___56___inashortburstofhigh-intensityexercise.Inshort,abrisk30-minutewalkwillburnfatwhilea100-yardsprintwillburnglycogen.
[A]positive[B]additional[C]duration[D]effectivee[E]shed[F]physical
[G]food[H]functions[I]participated[J]rely[K]cut[L]repeatedly
[M]uses[N]little[O]obvious
答案与解析：
47.E该空需填入动词原形，结合原意“和大多数美国人一梯状，你(的体重)可能也有几磅需要________”可知，E(去除)最符合文意。
49.A结合句意“令人惊奇的是，为了看到长期________效果你不必节食或常去健身馆”，可知空格处需填一形容词，初选后留下A、D。由于下文只是讲到运动会帮助减肥，但并未说明它的效果明显，所以此处宜选用意思上更宽泛的positive(正面的，有效的)。
50.H下文举例的breathing,bloodcirculationanddigestion都是人体的基本功能，且其后的functioning已给出了提示，故H最符合文意。
51.B该空需填入形容词，结合常识和句意“任何时候只要你活动，你都需要________能量”来看选项，B(额外的)符合文意。
52.C该句句意为“采用这两种能量消耗来源中的哪一种取决于你活动的强度和________”，结合下文提到的...lowtomoderatelyintenseandoflongduration...可知C最符合文意。
53.J结合句意“(活动的)强度越低，身体越________于脂肪作为其燃料”，该空应填入能和on搭配的动词，J最符合文意。
54.D结合常识可知，有氧运动是最有效的减肥方式，选项中D最符合文意。
55.L该空需填入副词，选项中只有L和N可作副词，由下文提到的walking,running,swimming,dancing,andjumping等可推知在这些有氧运动中四肢的活动是反复的，故排除N。
56.I该空需填入动词的过去分词，结合句意“如果你已经________高强度、爆发性的运动，你会燃烧更多的脂肪”可知I最符合文意。
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