2018届高考英语大一轮复习unit3underthesea课时规范训练新人教版选修7

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1、Unit3UndertheseaI•阅读理解A（2017•四川成都诊断）Fromsleepingstandinguptoshuttingdownhalfoftheirbrain,animalshavesomestrangesleepinghabits.Nowsomeoftheseunusualhabits,fromnappinggiraffestobirdsthatsleepwhileflying,havebeenshowninachart.Thischartshowsthatlittlebrownbats

2、areverylethargic,sleepingforaround19.5hoursperday.Thislongperiodofsleepisthoughttobeawayofconservingenergyanditmeansbrownbatsonlyhuntforafewhourseachnightwhentheirinsectfoodisavailable・Incontrast,giraffescangoweekswithoutsleepbecausetheselargeandslow-movin

3、ganimalsareconstantlyeasytotheattacksfrompredators・However,otheranimalsareexpertsatmultitaskingandcanswimorflywhi1esleeping.Forexamp]e,dolphinsandwhalessleepwhilekeepinghalfoftheirbrainalert（警觉），sotheydon，tdrown,withdo1phinstypicallynappingforaround10hours

4、aday.Themethodisknownas"logging”andithasbeenobservedinbottlenosedolphins,whichkeephalfoftheirbrainatalowlevelofalertness・Thisallowsthedolphintokeepenoughconsciousnesstocarryonbreathingthroughitsblowhole.Whileseaottersaren"talertwhiletheysleep,theyformrafts

5、sotheyarenotseparatedfromeachother.Thecreaturessometimesholdhandsorpawswhentheysleepandtypicallyeat,sleepandrestwhi1efloatingingroupsofrafts.1.Theunderlinedword"lethargic”inParagraph2isclosestinmeaningtoA.sleepyB.inactiveD.movablelongperiodofsleep?C.energe

6、tic2.WhydolittlebrownbatshaveaA.Toavoidsunshine.B.Tosavemoreenergy.C・Torelaxthemselves.D.Towaitfortheirinsectfood.3.Howdodolphinsavoiddrowningwhi1esleeping?A.Bytakingextranaps.B.Byholdinghandsorpaws.A.Bykeepinghalfoftheirbrainalert.B.Bybreathingthroughthei

7、rblowholes.1.Whatdoseaottersdoinordernottobeseparatedfromeachother?A.Theydon，tsleep.B.Theyfloatonrafts.C.Theyfloatingroups・D.Theyholdhandsallthetime.【语篇导读】文章介绍了小棕蝠、长颈鹿、海豚、鲸和海獭等动物特殊的睡眠习惯。1.解析：选A。词义猜测题。根据画线词后的sleepingforaround19.5hoursperday可知，小棕蝠每天大部分时间都在睡觉

8、，由此可推断lethargic在此表示“昏昏欲睡的”，与sleepy意义相近inactive意为"不活动的；怠惰的”:energetic意为“精力充沛的”；movable意为“活动的”。2.解析：选B。细节理解题。根据第三段前半句Thislongperiodofsleepisthoughttobeawayofconservingenergy...可知，小棕蝠睡得多是因为要保存体力。故选B项。3.解析：选Co细节理