七、阅读与回答问题（本题共5小题；每小题2分，满分10分）
请认真阅读下面短文，并根据短文内容回答问题。
WorldSleepDay,organizedbytheWorldSleepDayCommitteeoftheWorldAssociationofSleepMedicinesince2008,isheldonMarch21everyyear.
TheaimofWorldSleepDayistocelebratethebenefitsofgoodandhealthysleep.Eventsinvolvingdiscussions,presentationsofeducationalmaterialsandexhibitionstakeplacearoundtheworldandonline.
Sleepqualityplaysakeyroleinpeople’shealth.Researcherssaythattherearealotofadvantagesifwealwaysgetenoughsleep.Wecanbesmarter,thinner,healthierandmorecheerful.Alsowe’retohavebetterskin,bettermemoriesandlongerlives.Whenyouloseevenonehourofsleepforanyreason,itwillinfluenceyourperformancethenextday.
Ingeneral,adultsarethoughttoneedatleasteighthoursofsleepanight,butarecentsurveyfoundthat,onworkdays,only21%ofthemreallygetafulleighthoursofsleep,andanother21%getlessthansix.Forteenagers,ahealthyamountisabouteighttoninehourspernight.However,about80%ofhighschoolstudentsdon’tgetenoughsleepbecauseoftheirschoolworkorsomebadhabits.
27%ofpeoplethroughouttheworldhavesleepproblems.Nowthereareover80kindsofsleepdisorders,andmostpeopleknowlittleabouttheirdanger.So,forourgoodlifeandwork,it’snecessaryforustorealizetheimportanceofsleepandtrytohaveagoodsleep.
请将答案写在答题卡上
76.HowlonghasWorldSleepDaybeencelebratedsofar?
▲77.WhatisthepurposeofWorldSleepDay?
