2018高考英语一轮复习构想Unit3Inventorsandinventions课时作业

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1、Unit3　InventorsandinventionsⅠ.阅读理解A(2017·广西重点高中考试)Weighingtoomuchcandamageyourhealth,andobesityisagrowingproblemforbothkidsandadultsaroundtheworld.Sleepmightbeoneanswertotheproblem.Anewstudyhasfoundthatelementaryschoolstudentswhoslepttoolittleweremorelikelytogainpounds.Paststudieshaveshownalink

2、betweensleepinglessandweighingmore,butscientistshavehadatoughtimedetermining“which_came_first,_the_chicken_or_the_egg，”saysJulieC.LumengoftheUniversityofMichiganinAnnArbor.Inotherwords,ithasn'tbeenclearwhetherkidswhoweightoomuchhavetroublesleeping,orwhethersleepinglessleadstoweightgain.Bothscen

3、arios(可能出现的情况)seemedequallypossible.Togetabetterideaofwhichcauseswhich,Lumengandhercolleaguesinterviewedtheparentsof785thirdgradersfromaroundtheUnitedStates.Theparentsansweredquestionsabouthowwelltheirkidssleptthatyear.Threeyearslater,theparentsansweredthesamequestions.Bysixthgrade,18percentofk

4、idsinvolvedinthestudywereobese.Thescientistsfoundnorelationshipbetweenweightandthestudents'raceorgender.Italsodidn'tmatterhowstricttheirparentswere,orwhethertheywereboysorgirls.Obesitystruckallofthesegroupsequally.Instead,sleepseemedtobethekeyfactor.Overthe3yearsofthestudy,thechildrenaveragedah

5、ealthy9.5hoursofsleepanight.Somekids,however,sleptalotmore－orless－thanothers.Forthesixthgraders,everyhourofsleepabovethe9.5houraveragewaslinkedtoa20percentlowerriskofbeingobese.Sleepappeareddoublyimportantforthethirdgraders.Everyextrahourofsleeptheygotwaslinkedtoa40percentdropinobesity.【解题导语】　本

6、文是说明文。一项新的研究发现，睡眠过少的小学生更容易发胖。1．WhatdoestheunderlinedsentenceinParagraph2imply?A.Scientistshavefoundtheexactcausesofchildren'sobesity.B.Thereisalwayssomethingdifficulttounderstandthroughtheory.C.Thecauseeffectrelationshipbetweenweightandsleepisn'tclear.D.Aperson'sweighthassomethingtodowiththeamo

7、untofhissleep.答案与解析：C　考查句意理解。画线句表示的字面意思是“先有鸡还是先有蛋”，结合上下文的内容可知，文章引用这句话是为了表明“是睡眠少导致了肥胖还是肥胖导致了睡眠变少”这个问题还没有定论。下文的“Inotherwords,ithasn'tbeenclearwhetherkidswhoweightoomuchhavetroublesleeping,orwhethersleepinglessleadstoweightgain.Boths