完形填空专练(五)说明文
A
(2017·兰州市高考诊断考试)Whenyourchildissupposedtobedoinghomework,aretheychattingwiththeirfriendsonFacebookorplayinggames?Manystudieshaveshownthatmultitaskingdoesn’t__1__，__2__yourchildisprobablyproudlyclaimingtheycandotenthings__3__！Manypeoplebelievethattheycan__4__twoormoretasksatthesametime,butDr.EdwardHallowellsaysthisis__5__.Therealityisthatmultitasking__6__poorjobperformance.
Newhand-held__7__suchassmartphones,iPads,gamesandsocialnetworkingsitesmakeitveryeasytomultitaskand__8__attentionleadingtodifficultyfocusingonthetask__9__，suchaslisteningintheclassroomordoinghomework.“__10__，thebrainactually__11__kidsformultitaskingeventhoughyourchild’sperformanceoneverytaskgetsworseandworse.Kidsdon’tknowthattheyaredoing__12__becausetheyfeelbetterwhentheymultitask，”saysDr.EdwardHallowell.
__13__theappearanceofhand-helddevicesandsocialnetworkingsites,teachershavenoticedadifferencein__14__performance,criticalthinkingskillsandhowinformationis__15__.“Multitaskingpreventspeoplefromgainingadeepunderstandingoftheinformationtheyaretryingtolearn，”saysDr.EdwardHallowell.Kidshaveadifficulttimestickingwitha“difficulttounderstand”topicand__16__toallowthemselvestobedistracted(注意力分散的),totuneoutandswitch__17__toFacebookorusingtheircellphones__18__workingharderatunderstandingadifficultsubjectorproblem.Inthelong__19__，multitaskingaffectsgrades.OnestudyshowsthatkidsthatusetheInternetwhileinclassdo__20__ontests,resultinginlowergrades.
语篇解读：本文是一篇说明文，主要讲述了孩子们同时做多项任务对学业所造成的负面影响。
1．A.play B．understand
C．use D．work
解析：选D根据下文中的“Therealityisthatmultitasking__6__poorjobperformance.”可推知，同时做很多事情并没有什么效果。work“有效，起作用”。
2．A.onlyif B．eventhough
C．sothat D．nowonder
解析：选B根据语境可知，空处上下句之间存在逻辑上的让步关系，eventhough“虽然，尽管”，符合语境。
3．A