资源描述：
《四级15选10填空练习》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。
1、四级15选10填空练习Passage1Questions47to56arebasedonthefollowingpassage. PerhapslikemostAmericansyouhavesomeextrapoundsto47.Youmayevenhavetriedafaddietortwo,butfoundyourselfrightbackwhereyoustarted.Thekeytoweightlossisregular48activity.Andsurprisingly,youdon’thavetogiveupeatingormakethegymyoursecondhometo
2、seelong-term,49effects. Youbodyneedsacertainamountofenergytomaintainbasic50suchasbreathing,bloodcirculationanddigestion.Theenergyrequiredtokeepyourorgansfunctioningisreferredtoastherestingorbasalmetabolicrate. Anytimeyouareactive,51energyisrequired.Itisobtainedfromglycogenandfatstoredintheblood,l
3、iver,andmuscles.Thekeytolosingweightistodrawonthefatratherthanonthecarbohydratereserves. Whichofthetwoenergysourcesyouusedependsontheintensityand52ofyouractivity.Thehighertheintensity,themoreyourbodywillpullfromthestoredcarbohydrates.Thelowertheintensity,themoreyourbodywill53onfatasitsfuel. Aerob
4、icexerciseismost54forweightloss.Whenyouperformaerobicactivitiesyou55contractlargemusclegroupssuchasyourlegsandarms.Walking,running,rollerblading,swimming,dancing,andjumpingjacksareallformsofaerobicactivity. Surprisingly,ifyouraerobicactivityislowtomoderatelyintenseandoflongduration,youwillburnmore
5、fatthanifyouhad56inashortburstofhigh-intensityexercise.Inshort,abrisk30-minutewalkwillburnfatwhilea100-yardsprintwillburnglycogen. [A]positive[B]additional[C]duration[D]effective [E]shed[F]physical[G]food[H]functions[I]participated[J]rely[K]cut[L]repeatedly [M]uses[N]little[O]obviousPassage2Ques
6、tions47to56arebasedonthefollowingpassage. ThecomparativelytreelessplainsofNorthAfricahavesufferedaprogressivedryingup,both47andman-made,buttheregionwas48sorichinfertilesoilthatthedistrictwenowknowastheLibyanDesertwas,intheolddays,partofthegranary(粮仓)oftheRomanEmpire,andthecentreoftheSahara49abusyt
7、radingpopulationforalongperiod.Thatwaswhentherewere50inplentyandthefieldswerethetraditional“fieldsofthewoods”—clearingsintheforest—andthereforealwaystree51. Itisthetreesthatliftthewaterandsend52intotheairs
