Ifyouseesomeonedrowningspeedisveryimportant.Onceyougethimoutofthewaterifheisn'tbreathing.youhavefourminutesbeforehisbrainiscompletelydestroyed.Supporthisnecktilt(倾斜)hisheadbackandpresshischinupwards.Thisstopsthetongueblockingtheairwayinthethroatandissometimesenoughtogethimbreathingagain.Ifthatdoesn'tworkstartmouth-to-mouthbreathing.Presshisnostrils鼻孔)togetherwithyourfingers.Openyourmouthandtakeadeepbreath.Blowintohislungsuntilhischestrises.thenremoveyourmouthandwatchhischestfall.Repeattwelvetimesaminute.Keepdoinguntilhelparrives.

Tobringachildtolife.keepyourlipsaroundhismouthandnoseandgentlyblowintohismouth.GivethefirstfourbreathsasquicklyaspossibletofillthebloodwithoxygenIfinspiteofyoureffortshestarsturningablue-greycolouryoucanfeelnopulsethenpressingisthelastchanceofsavinghislife.

Witharmsstraightrockforwardspressingdownonthelowerhalfofthebreastbone.Don'tbetoohardoryoumaybreakarib.Checkhoweffectiveyouareseeingifhiscolourimprovesorhispulsebecomesindependenttoyourchestpressing.Ifthishappensstopthepressing.Otherwisecontinueuntilrescuearrives.

47.Thispassageismainlyabout_______.

A.howtosavepeopleoutofthewater

B.howtogivefirstaidtopeoplewhoaredrowning

C.howtodomouth-to-mouthbreathing

D.howtosaveachildfromariver

48.Onceyougetadrowningmanoutofthewaterifheisn'tbreathingyoumustfirst____

A.gethimbreathingagain

B.takehimtothenearesthospitalassoonaspossible

C.findsomeonetohelpyou

D.calltheFirstAid Centre

49.Inthelastparagraphtheword"rescue"means_____.

A.breath B.help C.doctor D.pulse

50.Ifthedrowningboyhasnopulse_______.

A.pressinghischinupwardsisenoughtogethimbreathing

B.blowingairintohismouthissuretosavehislife

C.pressinghisnostrilstogetherwithyourfingerscanwork

D.pressingisthelastchanceofsavinghislife

51.Whichofthefollowingstatementsistrue. ____.

A.Ifamando