u计划八年级数学寒假.docx
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u计划八年级数学寒假
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u计划八年级数学寒假
篇一：
20XX年八年级寒假用
units1~2
一、单项选择（10分）
（）1.LiLeiworksinengland.hecomestochina_____.
A.threetimeayearb.threetimesayearc.threetimesyearD.three
timeyear
（）2.hisgrandmotheriswellbecausesheoften_____.
A.exercisesb.smokesc.sleepsD.sings
（）3.---_____dotheyplayfootball?
---everyday.
A.howsoonb.howmuchc.howmanyD.how
often
（）4.here_____theresults_____thestudentactivitysurvey.
A.is;withb.are;ofc.is;ofD.are;
with
（）5.Althoughtheyfeeltired,_____theystillgoonworking.
A.andb.butc./D.so
（）6.Youhavea_____.Youshouldstopeatinganything.
A.headacheb.backachec.stomachacheD.fever
（）7.Thankyoualotforgivingmesomuch_____onhowtolearnenglishwell.
A.adviceb.ideac.hopeD.
answer
（）8.Don‘t_____onthebus.Thereisnowashroom.
A.drinkmuchwaterb.eatlotsofjunkfoodc.dosomereadingD.
sleepalot
（）9.Youshouldn‘t_____whenyouaretiredatnight.
A.gotobedearlyb.stopworkingc.worktoolateD.have
arest
（）10.YesterdayIhadalotofhomeworktodo.Ididit_____midnight（半夜）.
A.tob.untilc.atD.on
二、单词拼写（10分）.
11.haveagoodrest.Ihopeyoufeelb____________soon.
12.helooksu_____________.whatdidyousaytohim?
13.Ifyouhaveat_______________,youshouldseeadentist.
14.Don‘tthinkmuchofther_____________oftheexam.
15.Youmustlooka_____________yourhealth.
16.Thedoctorsaid,―openyourm____________andsayAh…‖
17.shehasaf____________.sheshoulddrinklotsofwater.
18.chinesedoctorsb_____________weneedabalanceofyinandyangtobe
healthy.
19.heist_______________.hewantstohavesomewater.
20.---canIhavealookatyourphotos?
----Yes,ofc_____________.
三、用括号内所给的词的正确形式填空（10分）.
21.my_______________lifestylehelpsmegetgoodgrades.（health）
22.heiskindofunhealthy.he_______________everexercises.（hard）
23.Youshould____________somehotteawithhoney.（drink）
24.Youlooktoo_____________out.Trytorelaxyourself.（stress）
25.chinesemedicineispopularinmany_______________countries.（west）
26.mom____________metoeatmorevegetables.（want）
27.Aliceistiredandhasalotof_______________.（head）
28.Youmusttrytoeat_______________meatandexerciseeveryday.（little）
29.Acathasfour_____________.（foot）
30.whatabout_____________everymorning?
（run）
四、根据中文意思，完成下列句子，每空填一词。
（每小题1分，共１０分）
31.关于说英语，有些学生说得挺好。
____________________speakingenglish,somestudentsspeakwell.
32.你怎么了？
我背疼。
what‘sthematterwithyou?
Ihavea____________________.
33.我们可以一周练习一两次钢琴。
wecanpracticethepiano__________or__________aweek.
34.保持健康是很重要的。
It‘simportantto____________________.
35.他最喜欢的节目是动物世界。
八年级英语寒假作业
（一）
一、词汇。
1.heneeds________（meet）hise-friend.
2.Theyenjoyed________（they）yesterday.
3.Kittywants________（close）thedoorand________（clean）thefloor.
4.hewrotealetterof________（invite）tohisfriends.
5.Therearealotof________（build）inbeijing.
6.Icantdrawthepictureatthe________（begin）.
7.hesaidhedidntspeakJapaneseany________（much）.
8.huangshanisaplaceof________（interesting）inchina.
9.Ithinkitwasan________（amaze）thing.
10.whatabout________（visit）theoldfriends?
11.howdoyougotoschoolwhenit________（snow）?
12.Americanstudentsspend________（little）time________（do）homeworkthan
chinesestudents.
13.Thereareeleven_________（play）inafootballteam.
14.Doyoulike________（walk）toschooleveryday?
15.herbikeandsandy‘sbikearenot________（like）.
16.Daniel‘sschoolisquite_________frommike‘s.
Therearemany_________betweenthetwoschools.（different）
17.Thereareat________（little）50studentsinmyclass.
18.The_______oftheriveris500kilometers.（long）
19.Theweathertodayiseven_______（bad）thanyesterday.
20.woodlandschoolisa_______（mix）school.
21.nancyplayssoftball_________（two）aweek.
22.Drivingacartoschoolis_______（fast）than_______（take）thebus.
23.nancy‘sbrotherhad______lessonlastyear,thisyearhe______toschooleveryday.
24.Icouldn‘t__________（相信）myearswhenIheardthesurprisingnews.
25.mr.Liisalwayskindenoughtohelpus________（解决）someproblems.
26.Allofuslikeher__________（圆）face.sheissuchalovelygirl.
27.heis__________（面带）asmileonhisface.whatmakeshimsohappy?
28.haveagoodhoildayandIwill__________（想念）youwhenyouareaway.
三、根据句意，用括号内所给词的适当形式填空。
1.pleasewritean________（invite）lettertoyoure-friend.
2.Yesterdaytheywenttoseemany________（interest）places.
3.whenthebusstopped,weallgotoff________（quick）.
4.Youmustdoyourhomeworkby________（you）.
5.walkslowlyaroundthebiglakeandfeelthe______（beautiful）oftheoldpark
6.Thereareoldstonebuildings______（call）thepyramids.
7.Thanksfor______（keep）oursecret.
8.Lindawanted______（have）lunchatschoolyesterday.
9.Look!
some______（climb）areclimbingupthemountain.
10.whoisthe______（win）,LilyorLucy
11.ofallthesepopularstars,IthinkRainisthe__________（smart）.
12.myuncleisa__________（sport）man.heisgoodatmanyballgames.
13.Ienjoymanyexcitingoutdoor_____（activity）.Andswimmingismyfavourite.
14.wewereallsurprisedathis__________（high）whenwesawhim.
15.noneofuscananswerthequestion_______（correct）.Theteacherisunhappy.
四、单项选择
（）1.Theskyisblue,________everythingisnice.
A.andb.orc.soD.but
D.from;to
D.am
D.arrive
D.stays
D.visited（）2.hereisLindasletter________hermother________thetrip.A.from;withA.areb.to;aboutb.isb.getc.of;forc.werec.arriveatc.tostayc.tovisit（）3.There________alotoftrafficinthestreet.（）4.-whendidshe_________beijing?
-Thismorning.A.arriveinA.stayA.visit
（）5.mikedecided________athome.b.stayingb.visits（）6.beijingZooisaninterestingplace______.
（）7.IdontwanttowatchTVthisevening.Illlistentomusic______.
A.insteadofb.also
c.tooD.instead（）8.KittyandIfeltsickfor______.A.manyofthetripc.moreofthetripA.whenb.mostofthetripD.themostofthetripc.becauseD.before（）9.______Isawmyoldfriend,Icouldntbelievemyeyes.b.If
（）10.Dontdrink______water.Thereisnowashroomonthebus.
A.toomuchb.muchtooc.toomanyD.manytoo
（）11.—______hegaveus!
—Yes.healwayshasgoodideas.
A.whatagoodadviceb.whatgoodadvice
c.howagoodadviceD.howgoodadvice
（）12.LittleJimmyiseightyearsold,butwehavesevencandlesonly,weneed
____candle.
A.onlyoneb.onemorec.somemoreD.onemuch
（）13.onasummerafternoon,itisoften____underabigtreethaninthesun.
A.toocoolerb.muchcooler
c.verycoolerD.thecoolest
（）14.couldyousay______aboutyourteacher,please?
I‘dliketoknow______
abouthim.
A.nothingelse;moreb.anythingelse;most
c.anythingother;moreD.somethingelse;more
（）15.—whichgirlisyourcousin,Jacky?
—______oneofthetwois.sheiscalledbetty.
A.Thetallb.Thetallestc.ThetallerD.Ataller
（）16.—whodoyouthinkisthebetterfootballplayer,KakaorRonaldinho?
—It‘shardtosay.IlikeKaka.butIthinkRonaldinhoplays____Kaka.
A.asbetterasb.asgoodas
c.aswellasD.sowellas
（）17.weareallhappytoseethegreatchangesinnanjing.wehopeitwillbe
much______tomorrow.
A.beautifulb.morebeautiful
c.mostbeautifulD.themostbeautiful
（）18.—Youlook______thismorning.whathappened?
—myfatherhurthislegthismorning.Andheisinhospital.
A.happyb.finec.surprisedD.worried
（）19.—wouldyoulikesomemorecake?
—______.I‘mfullnow.
A.no,thanksb.Yes,thankyou
c.I‘dlovetoD.Yes,please
（）20.—wouldyoumind______thelight?
Iwanttoreadnewspapers.
—notatall.
A.toturnonb.turningoffc.toturnoffD.turningon
（）21.—Keepawayfromtheladder,boys.It‘s__tostandthere.Itmayfalldown.
—Thanks,mr.Li.wewillbecareful.
A.interestingb.excitingc.boringD.dangerous
（）22.—Ithinkenglishisoneofthemostboringsubjects.
—______.You‘llfinditinterestingifyouspendmoretimeonit.
A.Youarerightb.sorry,Idon‘tagreewithyou
c.It‘sdifficultD.That‘sright
（）23.myfatherisavery______driverandIfeel______whenIaminhiscar.
A.carefully;happyb.careful;happily
c.careless;happyD.careful;safe
（）24.—AreportsaysthathuoYingdongdonated15,000millionhKdollarsin
hislife.
—how______hewas!
A.shyb.honestc.generousD.cheerful
（）25.—Doyoustillrememberyouwonanawardlastseptember?
—Yes,Ido.Thatisthe______memoryinthepastfewyears.
A.worstb.mostpleasantc.mostfondD.mostgood
七、用适当的反身代词填空。
1.weenjoyed____________inthezooyesterday.
2.shetaught____________englishwhenshewasyoung.
3.Youmustlookafter____________,Liping.
4.mrwangsaid,"Donthurt____________,children."
5.Icut____________yesterday.
6.heisteaching__________chinesethroughTV.
7.help__________tosomecakes,JackandTom.
8.Thelittlegirlcangohomeby_________.
9.Thetwinslearnedswimmingby__________whentheywereten.
10.Tomenjoyed__________attheparty.
八、完形填空
Deareditor,
Iamnotfeelinggoodnow.IthinkIamintrouble.Iamnotagood-lookingboyandI‘mnotclever,either.Ithinknobodyme,soIusuallyfeelbad.sometimesIthinkthatifIleavehome,nobodywouldcare（在乎）.canIstopfeelinglikethis?
willyoubekindenoughtohelpme?
peter
篇二：
寒假作业（数学）答案
寒假作业（数学）参考答案
1.解:
因为对任意的n?
n,点（n,sn），均在函数y?
bx?
r（b?
0且b?
1,b,r均为常数的图像上.所以得
?
sn?
bn?
r,当n?
1时,a1?
s1?
b?
r,当n?
2
时,an?
sn?
sn?
1?
bn?
r?
（bn?
1?
r）?
bn?
bn?
1?
（b?
1）bn?
1,又因为{an}为等比数列,所以
r?
?
1,公比为b,an?
（b?
1）bn?
1
（2）当b=2时，an?
（b?
1）bn?
1?
2n?
1,bn?
2（log2an?
1）?
2（log22n?
1?
1）?
2n则
bn?
12n?
1b?
13572n?
1b?
1b2?
1
,所以1
?
····n?
?
?
?
b1b2bn2462nbn2n
b?
13572n?
1b1?
1b2?
1
····n?
?
?
?
?
.b1b2bn2462n
下面用数学归纳法证明不等式
①当n?
1时,左边=
33
,右边
因为?
所以不等式成立.22
②假设当n?
k时不等式成立,
即
b?
13572k?
1b1?
1b2?
1
····k?
?
?
?
?
.b1b2bk2462k
则当n?
k?
1时,左边=
b?
1bk?
1?
1357b1?
1b2?
12k?
12k?
3
····k?
?
?
?
?
?
?
b1b2bkbk?
12462k2k?
2
2k?
3?
?
?
?
?
2k?
2所以当n?
k?
1时,不等式也成立.由①、②可得不等式恒成立.
【命题立意】:
本题主要考查了等比数列的定义,通项公式,以及已知sn求an的基本题型,并运用数学归纳法证明与自然数有关的命题,以及放缩法证明不等式.
1
3.解：
（Ⅰ）设椭圆长半轴长及分别为a,c,由已知得
a?
c?
1,{解得a=4,c=3,a?
c?
7.
x2y2
?
?
1.所以椭圆c的方程为
167
（Ⅱ）设m（x,y）,p（x,y1）,其中x?
?
?
4,4?
.由已知得
x2?
y122
?
e.22
x?
y
2
而e?
34
，故16（x2?
y21）?
9（x2?
y2）.①由点p在椭圆c上得y2?
112?
7x2
1
16
,
代入①式并化简得9y2?
112,
所以点m
的轨迹方程为y?
?
4?
x?
4）,轨迹是两条平行于x轴的线段.4.解：
（Ⅰ）依题意有
a1?
（a1?
a1q）?
2（a1?
a1q?
a1q2
）由于a1?
0，故
2q2
?
q?
0又q?
0q?
－
1
，从而
25分
a?
a（?
1）2
1?
3（Ⅱ）由已知可得1
2
故a1?
4
（41?
（?
1n
sn?
））
?
81?
（?
1）n）
从而1?
（?
1322）
10分
x2y2
5.解：
（Ⅰ）由题意，c=1,可设椭圆方程为1?
b2
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