MacwascyclingalongaroadinCanada’sYukonhalfwaythrougha2750-milebiketourtoPrudhoeBayAlaska.Hewascarryinga30-poundcampingbag  41  hewasn’tmovingveryfast.Suddenlyheheardloudbreathingbehindhim.“Manthat’sabigdog!”hethought.Helookedtothesidebuttohisgreat  42 hesawthatitwasn’tadogbutawolfrunninghardto  43  him.

   Mac’sheartjumped.Hereachedforthe  44  fromhisbag.Withonehandonthehandlebarhe  45  thespray.Abrightredcloudcoveredthewolf  46 anditfellbackshakingitshead.Butaminutelateritwasbyhissideagain.Hesprayedasecondtimeandthewolffell  47  againbutonlytoquicklyrestartits  48 .

   Thewolfwasgettingcloserandcloser  49  adozenyardsaway.Macwavedandyelledatpassingmotoristsbutmeanwhile  50  hard.Heknewclearlythathemustbe  51  nottoslowdown.Otherwisehewouldbecomea  52  ofthewolf.

   PaulandBeckyweredrivingalongthesameroad.Fromadistancetheyspottedwhatthey5 53  wasadogrunningafteramanonabike.Astheygot  54 theyrealizeditwasawolf.

   Macheardacarcomingupbehindhimandhesloweddown.Thecarveered(改变方向)aroundthe  55 thensuddenlystoppedinfrontofhim.Mac  56  offhisbikeanddashedfortheback  57  ofthecar.Itwaslocked.Paulquickly  58  thedoorsoastoletMacinandthe  59  mandivedinshuttingthedoorbehindhim.

ItwasquiteawhilebeforeMacbecame  60  andcriedout:“IthoughtIwasgoingtodie!”AndPaulandBeckyweregladthattheyhadgivenahelpinghandtopeopleinneed.

41.A.but    B.so    C.for     D.or

42.A.regret    B.disappointment    C.fear    D.anger

43.A.catchupwith    B.breakawayfrom    C.giveinto    D.comebackto

44.A.hammer    B.stick    C.gun           D.spray

45.A.dropped    B.fired    C.threw         D.held

46.A.inturn    B.atlast    C.intime    D.atrandom

47.A.back    B.down    C.behind    D.over

48.A.flight    B.race    C.journey    D.attack

49.A.still    B.just    C.also    D.even

50.A.kicked    B.rode    C.hit    D.pressed

51.A.crazy    B.wrong     C.careful    D.f