Blooddonationisawonderfulthingdonebyus．Tobeginwith，extensivestudiesshowthatbloodplaysanimportantroleinmedicaloperation．Indonatingourbloodweareactuallysavingthepreciouslivesofthesick．Next，beingahealthyperson，losing200mlofbloodisonlyasmallsacrifice（牺牲） andhelpstoimproveourmetabolism （新陈代谢）．Finally，donatingbloodhelpsusinforminggoodcharacteranddevelopingoursenseofsocialresponsibility．Blooddonationisn'tacomplicatedissue，butweneedtokeepafewinstructionsinmind．

First，don'tgoforblooddonationwithanemptystomach．Wecaneatanythingandafterhavingarightdietwe'llfeelstrongandcomfortabletodonateblood．Fortherequiredhemoglobin （血色素） inthebody，wecandrinklotsoffruitjuice．Foragoodbloodflowinthebody，let'sdrinkatleast6-7glassesofwaterdaily．Completelyavoidtakingalcoholorcaffeineadaybeforeandafterdonatingourblood．Weshouldn'tsmokehalfanhourbeforemakingblooddonation．

Whenwe'regoingforblooddonation，firsttellthenursetocheckourhemoglobinlevel．Duringtheinjectionweneedtotakeadeepbreathandtrytocalmourselvesdown．Duringblooddonation，keepourselvescoolandcalm．

Blooddonationisaveryfastprocess，butweneedtotakecareofourselvesafterblooddonation．Forexample，takearestfor15minutesafterthedonation．Eatsomethinganddrinkjuiceafterleavingtheblooddonationcenter．Makesurenottoskipmealsafterblooddonation．Smokingshouldbeavoideduptoonehourafterblooddonation．

Atlastbeproudofourselvesthatwe'vedoneagreattaskinmakinganattemptofsavingsomeone'slife．Blooddonationisasocialresponsibilityforeverycitizen，especiallyforus，youngstudents．Weshoulddoitnotbecauseitdoesusnoharmbutbecauseitisanoblethingtodoandithelpsothersagreatdeal．

76．Whatadvantagewillahealthypersonhaveifheorsheloses20mlofblood？

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77．Howlongshouldwerestafterblooddonation？

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78．Howmuchwatershouldwedrinkeverydayforagoodbloodflowinthebody？

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79．Whyisblooddonationasocialresponsibilityforyoungpeople？

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80．Whatdoyouthinkofblooddonation？（自拟一句作答）