2017步步高英语课时作业新世纪
管理学 点击： 2012-11-08
2017步步高英语课时作业新世纪篇一
【步步高 学案导学设计】2014-2015学年高中英语(人教版,必修一)课时作业：Unit 2 第1课时]
Unit 2 English around the world
Period One Warming Up & Reading
Ⅰ.用适当的介、副词填空
1．Why not go ________ Underground?
2．But the subway station is far ________.
3．So by the 1600’s Shakespeare was able to make use ________ a wider vocabulary than ever before.
4．In 1620 some British settlers moved ______ America.
5．English now is also spoken ________ a foreign or second language ________ South Asia.
6．It was based more ________ German than the English we speak ________ present.
7．So why has English changed ________ time?
8．Actually all languages change and develop when cultures meet and communicate ________ each other.
Ⅱ.佳句翻译与仿写
1．Native English speakers can understand each other even if they don’t speak the same kind of English.
翻译：
________________________________________________________________________
________________________________________________________________________ 仿写：史密斯先生虽然很忙，他还是愿意帮我们。
Mr. Smith likes to help us ____________________________________________.
2．Why do you think people all over the world want to learn English?
翻译：
________________________________________________________________________ 仿写：你认为我在哪里能够买到一本这样的书？
______________________________ get such a book?
3．Today more people speak English as their first，second or a foreign language than ever before .
翻译：
________________________________________________________________________
________________________________________________________________________ 仿写：你的英语不久就会讲得比以前更好。
You will soon speak English ________________________________________.
4．At first the English spoken in England between about AD 450 and 1150 was very different from the English spoken today.
翻译：
________________________________________________________________________
________________________________________________________________________ 仿写：在暴风雨中被刮倒的树木已经被移除出路面。
The trees ______________________________ have been moved off the road.
Ⅲ.单项填空
1．Do you know that ______ more than one kind of English?
A．there are B．there is C．are there D．is there
2．Later in the next century，people from England made voyages ________ other parts of the world.
A．conquering B．conquered C．to conquer D．conquer
3．I’d like to ______ to your apartment.
A．come up B．come about C．come out D．come across
4．In some important way they are very different from one ______.
A．other B．another C．others D．each other
5．At that time two big changes in English spelling happened.The ______ gave a separate identity to American English spelling.
A．later B．late C．lately D．latter
6．Today the number of people ______English in China ______ increasing rapidly.
A．learning；is B．learn；are
C．learned；is D．to learn；are
7．Later in the 18th century some British people ________ to Australia too.
A．have taken B．are taken
C．were taken D．were being taken
8．English is also spoken in Singapore and Malaysia and countries in Africa ______ South Africa.
A．such as B．that is C．namely D．for example
9．______ the 16th century，about five to seven million people spoke English.
A．At the end of B．In the end of
C．By the end of D．To the end of
10．English became less like German because those ________ruled England spoke first Danish and later French.
A．who B．/ C．which D．whom
Ⅳ.阅读理解
In order to know a foreign language thoroughly(完全地)，four things are necessary.First，we must understand the language when we hear it spoken.Second，we must be able to speak it ourselves，correctly with confidence(自信)and without hesitation(犹豫)．Third，we must be able to make sentences that are correct in grammar.There is no short way to succeed in language learning .A good memory(记忆)is a great help，but is not enough only to memorize the rules from a grammar book.It is no much use learning by heart long lists(一览表)of words and their meanings，studying the dictionary and so on.We must learn by using the language.If we are pleased with a few rules we have memorized，we are not really learning the language.We must“learn through use”．Practice is important.We must practise speaking and writing the language whenever(无论何时)we can.
1．The most important things to learn a foreign language are ______.
A．understanding and speaking
B．hearing，speaking，reading and writing
C．writing and understanding
D．memorizing and listening
2．Someone hears and writes English very well，but he speaks it very badly.This is because________.
A．he doesn’t understand the language when he hears it spoken
B．he doesn’t have a good memory
C．he always remembers lists of words and their meanings
D．he often hesitates to practise speaking it
3．One can never learn a foreign language well only by ________.
A．much practice
B．studying the dictionary
C．learning through use
D．using the language
4．Which of the following is the most important in learning a foreign language?
A．A good memory.
B．Speaking.
C．Practice.
D．Writing.
5．“learn through use” means ______.
A．we use a language in order to learn it
B．we learn a foreign language in order to use it
C．we can learn a language well while we are using it
D．
both B and C
rule n．规则，规章；习惯，常规
生义：v.控制；统治，支配
She couldn’t rule herself at that moment.
当时她不能控制自己。
The queen ruled over her country for 20 years.
这位女王统治了她的国家20年。
【答案解析】
Period One Warming Up&Reading
Ⅰ.1.by 2.away 3.of 4.to 5.as；in 6.on；at 7．over 8.with
Ⅱ.
1．以英语作为母语的人，即使他们所讲的语言不尽相同，也可以相互理解。
even if/though he is very busy
2．你认为世界各地的人们为什么都要学英语呢？
Where do you think I can
3．如今说英语的人比以往任何时候都多了，他们有的是作为第一语言来说，有的是作为第二语言或外语。
much better than ever before
4．起初从公元450年到1150年间英国人所说的英语与今天所说的英语很不一样。 blown down in the storm
Ⅲ.
1．B [此处是that引导的宾语从句，应该用陈述语序，排除C、D两项；”more than one＋单数名词”虽然在意义上表示复数但因中心词是单数形式，谓语动词也须用单数。]
2．C [句意为：后来，在接下来的一个世纪英国人开始航海去征服世界其他地区。此处用动词不定式作目的状语。]
3．A [句意为：我乐意到你的公寓去。come up to ...“达到……”，符合题意。come about“发生，产生”；come out “出现，开花，出版”；come across“偶遇”。]
4．B [one another“彼此，互相”，表示三个或三个以上的人或事物之间的相互关系。]
5．D [表示两者中的后者用latter。later是late的比较级，也可单独作副词用，意为“后来，以后”； late adj.&adv.“迟(的)，晚(的)”；lately adv.“最近，近来”。]
6．A [people与learn之间是主谓关系，故用现在分词短语作后置定语；the number of “……的数目”，其谓语动词用单数。]
7．C [people与take之间是动宾关系，故用被动语态，排除A；由时间状语”in the 18th century”可知用一般过去时，故选C。]
8．A [such as用于列举事物，常用在列举的事物和前面的名词之间，所列举事物的数量不能等同于前面所提事物的总数，否则应用that is或namely。for example用于举例说明，一般只列举同类人或事物中的“一个”且其后多跟句子。]
9．A [at the end of表示“在……的末尾/尽头”，既可用于时间方面，也可用于空间方面；in the end“最终，终于”，在句中用作状语；by the end of“到……结束时”，常与完成时连用。]
10．A [在because引导的原因状语从句中包含一个定语从句，先行词those在此处指人，故用关系代词who引导定语从句，who在从句中作主语，不可省略。]
Ⅳ.
1．B [学习一门外语最重要的是听、说、读、写四种技能，A、C、D三项都不够全面。]
2．D 3.B
4．C [在学习英语时，最重要的还是“练”(practice)，古语说，Practice makes perfect“熟能生巧”，故选C项。]
5．C [“在用中学”，文章强调练习的重要性。A项颠倒了学与用的关系，B项虽对，却不符合题意。]
2017步步高英语课时作业新世纪篇二
【步步高 学案导学设计】2014-2015学年高中英语(人教版,必修一)课时作业：Unit 1 第1课时]
Unit 1 Friendship
Period One Warming Up & Reading
Ⅰ.用适当的介、副词填空
1．Add ________ your score and see how many points you get.
2．You will ignore the bell and go somewhere quiet to calm your friend ________.
3．You will tell your friend that you are concerned ________ him/her and you will meet after class and talk then.
4．Do you want a friend whom you could tell everything ________，like your deepest feelings and thoughts?
5．Or are you afraid that your friend would laugh ________ you，or would not understand what you are going through?
6．I don’t want to set down a series ________ facts ________ a diary as most people do.
7．I’ve grown so crazy ________ everything to do ________ nature.
8．________ example，one evening when it was so warm，I stayed awake ________ purpose ________ half past eleven in order to have a good look ________ the moon by myself. Ⅱ.佳句翻译与仿写
1．I wonder if it’s because I haven’t been able to be outdoors for so long that I’ve grown so crazy about everything to do with nature.
翻译：
________________________________________________________________________
________________________________________________________________________ 仿写：我不知道是不是因为我来晚了他才生气的。
I wonder if ________________________ I came here late ________ he got angry.
2．I can well remember that there was a time when a deep blue sky，the song of the birds，moonlight and flowers could never have kept me spellbound.
翻译：
________________________________________________________________________
________________________________________________________________________ 仿写：曾经有段时间我弟弟很厌倦学习。
________________________________ my younger brother was tired of study.
3．Another time five months ago，I happened to be upstairs at dusk when the window was open.
翻译：
________________________________________________________________________
________________________________________________________________________ 仿写：当事故发生时，我碰巧在那里。
________________________________ when the accident happened.
4．I didn’t go downstairs until the window had to be shut.
翻译：
________________________________________________________________________ 仿写：直到他回来，妈妈才去睡觉。
His mother ________________________________ he got back.
5．It was the first time in a year and a half that I’d seen the night face to face...
翻译：
________________________________________________________________________ 仿写：我告诉导游这是我第一次到台湾旅游。
I told the guide that ________________________________________________ in Taiwan. Ⅲ.单项填空
1．You had to pay to get it ______.
A．repair B．to repair C．repairing D．repaired
2．While ______ the dog，you were careless and it got loose and was hit by a car.
A．walk B．walked C．walking D．to walk
3．You will tell him that he should ______ before，so you don’t let him look at your paper.
A．have studied B．study
C．be studying D．have been studied
4．You will tell her to look at ______ paper.
A．someone else B．someone else’s
C．someone’s else D．someone’s else’s
5．Are you afraid that your friend would not understand ______ you are going through?
A．that B．which C．whether D．what
6．She and her family hid away for nearly twenty－five months ______they were discovered.
A．when B．before C．after D．if
7．I wonder if it’s ______ I haven’t been able to be outdoors for so long that I’ve grown so crazy about everything to do with nature.
A．for B．since C．as D．because
8．But as the moon gave far ______ light，I didn’t dare ________a window.
A．too much；open B．much too；open
C．too much；opening D．much too；to open
9．I’m only able to look at nature through dirty curtains ______ before very dusty windows.
A．hang B．to hang C．hanging D．hung
10．It was the first time in a year and a half that I’d seen the night ______.
A．hand in hand B．face to face
C．shoulder to shoulder D．side by side
Ⅳ.阅读理解
Too many people want others to be their friends，but they don’t give friendship back.That is why some friendships don’t last long.To have a friend，you must learn to be one.You must learn to treat your friend the way you want your friend to treat you.Learning to be a good friend means learning three rules：be honest；be generous；be understanding.
Honesty is where a good friendship starts.Friends must be able to trust one another.If you do not tell the truth，people usually find out.If a friend finds out that you haven’t been honest，you may lose the friend’Generosity means sharing and sharing makes a friendship grow.You do not have to give your lunch money or your clothes.Naturally you will want to share your ideas and feelings.These can be
very valuable to a friend.They tell your friend what is important to you.By sharing them，you help your friend know you better.
Sooner or later everyone needs understanding and helping with a problem.Something may go wrong at school.Talking about the problem can make it easier to solve.Turning to a friend can be the first step in solving the problem.So to be a friend you must listen and understand.You must try to put yourself in your friend’s place so you can understand the problem better.
No two friendships are ever exactly alike.But all true friendships have three things in common.If you plan to keep your friends，you must practice honesty，generosity and understanding.
1．Some friendships don’t last very long because ______.
A．there are too many people who want to make friends
B．some people receive friendship but don’t give friendship back
C．those who give others friendship receive friendship from others
D．they don’t know friendship is something serious
2．According to the passage，honesty is________.
A．something countable
B．the base of friendship
C．as important as money
D．more important than anything else
3．Which of the following isn’t mentioned in the passage?
A．Always tell your friends the truth.
B．Sharing your mind with your friends is of great value.
C．Discussing your problems with your friends often helps to solve the problem.
D．A friend who gives you his lunch money is a true friend.
4．The best title of this passage is ________.
A．Honesty Is the Best Policy
B．A Friend in Need Is a Friend Indeed
C．How to Be Friends
D．Three Important Points in Life
5．What’s the meaning of “count on” in this passage?
A．数，点(数) B．认为，看作
C．重视 D．期待
1．upset adj.心烦意乱的；不安的；vt.(upset，upset)使不安；使心烦
生义：vt.打乱，搅乱；打翻，碰倒
His sudden illness upset my plan.
他突然生病搅乱了我的计划。
She stood up suddenly upsetting a glass of wine.
她突然起身，碰倒了一杯酒。
2．face n．脸，面孔，面容；表情；表面
生义：v.面对，面向，朝着
He lives in a house facing(to the)south.
他住在面朝南的房子里。
He is faced with a lot of business troubles.
他面临着很多生意上的麻烦。
【答案解析】
Period One Warming Up & Reading
Ⅰ.1.up 2.down 3.about 4.to 5.at 6.of；in 7．about；with 8.For；on；until；at Ⅱ.
1．我不知道这是不是因为我长久无法出门的缘故，我变得对一切与大自然有关的事物都无比狂热。
it was because；that
2．我记得非常清楚，以前，湛蓝的天空、鸟儿的歌唱、月光和鲜花，从未令我心迷神往过。
There was a time when
3．还有一次，就在五个月以前的一天傍晚，我碰巧在楼上，窗户是开着的。
I happened to be there
4．我一直等到非关窗不可的时候才下楼去。
didn’t go to bed until
5．这是我一年半以来第一次目睹夜晚……
it was the first time that I had travelled
Ⅲ.
1．D [此处考查“get sth. done”结构，意为“让某事被做”。]
2．C [在时间、条件、方式、让步状语从句中，如果从句的主语与主句的主语一致或从句的主语为it，并且从句的谓语动词包含be，常可以省略从句中的主语和be动词。本句的完整形式为：While you were walking the dog，you were...。]
3．A [should have done表示“本应该做某事，而实际上没有做”，符合题意。]
4．B [someone else“其他人”，其所有格形式是在else后加“’s”。]
5．D [句意为：你是否担心你的朋友会不理解你目前所经历的一切呢？what引导宾语从句，且在从句中作go through的宾语。]
6．B [此处before引导时间状语从句，表示“……(之后)才……”。]
7．D [在强调句中，it is之后的表示原因的从句中，只能用because来引导。]
8．A [此处too much“太多”用作形容词短语，修饰不可数名词；much too“太”，是副词短语，修饰形容词或副词。dare用作实义动词时，在否定句中，其后的动词不定式符号to可省略。]
9．C [hanging...是现在分词短语作后置定语，修饰curtains。]
10．B [face to face“面对面地”，符合题意。hand in hand“手拉手”；shoulder to shoulder“肩并肩”；side by side“并肩地”。]
Ⅳ.
1．B [由第一段第一句话可知。]
2．B [由第二段的“Honesty is where a good friendship starts.”可知。]
3．D [通读全文A、B、C都提到了。]
4．C [由文章第一段最后一句和最后一段可知该文主要讲了交友必须做到的三件事。]
5．D [好朋友总是期待彼此说实话、办实事。]
2017步步高英语课时作业新世纪篇三
步步高课时作业综合检测(二)
综合检测(二)
(时间：90分钟 满分：100分)
一、选择题(本题10个小题，每小题4分，共40分) 1．关于物体的运动下列说法正确的是( )
A．做曲线运动的物体，所受的合力可能为零，如匀速圆周运动 B．做曲线运动的物体，有可能处于平衡状态 C．做曲线运动的物体，速度方向一定时刻改变
D．做曲线运动的物体，所受的合外力的方向有可能与速度方向在一条直线上
图1
2．如图1所示的皮带传动装置中，甲轮的轴和塔轮丙和乙的轴均为水平轴，其中，甲、 丙两轮半径相等，乙轮半径是丙轮半径的一半．A、B、C三点分别是甲、乙、丙三轮的 边缘点，若传动中皮带不打滑，则( ) A．A、B两点的线速度大小之比为2∶1 B．B、C两点的角速度大小之比为1∶2 C．A、B两点的向心加速度大小之比为2∶1 D．A、C两点的向心加速度大小之比为1∶4
3．设人造地球卫星绕地球做匀速圆周运动，卫星离地面越高，则卫星的( ) A．速度越大 B．角速度越大 C．向心加速度越大 D．周期越长 4．为训练宇航员能在失重状态工作和生活，需要创造一种失重的环境．在地球表面附近， 当飞机模拟某些在重力作用下的运动时，就可以在飞机座舱内实现短时间内的完全失重 状态．现要求一架飞机在速度大小为v1＝500 m/s时进入失重状态试验，在速度大小为 v2＝1 000 m/s时退出失重状态试验．重力加速度g＝10 m/s2.则下列说法可能正确的是 ( )
A．飞机需要模拟竖直上抛运动 B．飞机需要模拟向上加速运动 C．完全失重状态的时间可能是150 s D．完全失重状态的时间可能是30 s
5．小船过河时，船头偏向上游与水流方向成α角，船相对水的速度为v，其航线恰好垂 直于河岸，现水流速度稍有增大，为保持航线不变，且准时到达对岸，下列措施中可行 的是( )
A．减小α角，增大船速v B．增大α角，增大船速v C．减小α角，保持船速v不变 D．增大α角，保持船速v不变
6．飞行员的质量为m，驾驶飞机在竖直平面内以速度v做半径为r的匀速圆周运动，在 轨道的最高点和最低点时，飞行员对座椅的压力( ) A．是相等的 B．相差mv2/r C．相差2mv2/r D．相差2mg 7．一个静止的质点，在两个互成锐角的恒力F1、F2的作用下开始运动，经过一段时间 后撤掉其中的一个力，则质点在撤去该力前后两个阶段中的运动情况分别是( ) A．匀加速直线运动，匀减速直线运动 B．匀加速直线运动，匀变速曲线运动 C．匀变速曲线运动，匀速圆周运动 D．匀加速直线运动，匀速圆周运动 8．从倾角为θ的足够长的斜面上的M点，以初速度v0水平拋出一小球，不计空气阻力， 落到斜面上的N点，此时速度方向与水平方向的夹角为α，经历时间为t.下列各图中， 能正确反映t及tan α与v0的关系的图象是( )
9．如图2所示，
图2
一直角斜面固定在地面上，右边斜面倾角60°，左边斜面倾角30°，A、B两物体分别系 于一根跨过定滑轮的轻绳两端，分别置于斜面上，两物体可以看成质点，且位于同高度 处于静止平衡状态，一切摩擦不计，绳子均与斜面平行，若剪断绳，让两物体从静止开 始沿斜面下滑，下列叙述正确的是( ) A．落地时两物体速率相等 B．落地时两物体机械能相等 C．落地时两物体重力的功率相同 D．两物体沿斜面下滑的时间相同
10．质量为m的小球被系在轻绳一端，在竖直平面内做半径为R的圆周运动，运动过程 中小球受到空气阻力的作用．设某一时刻小球通过轨道的最低点，此绳子的张力为7mg， 在此后小球继续做圆周运动，经过半个圆周恰好通过最高点，则在此过程中小球克服空 气阻力所做的功为( )
111A.mgR B.mgR C.mgR D．mgR
11．两个同学根据不同的实验条件，进行了“探究平抛运动规律”的实验
(1)甲同学采用如图3所示的装置，用小锤打击弹性金属片，金属片把球A沿水平方向弹 出，同时球B被松开，自由下落，观察到两球同时落地，改变小锤打击的力度，即改变 球A被弹出时的速度，两球仍然同时落地，这说明______________．
(2)乙同学采用频闪照相的方法拍摄到如图4所示的“小球做平抛运动”的照片．图中每 个小方格的边长为1.25 cm，则由图4可以求得拍摄时每隔________s曝光一次，该小球 平抛的初速度大小为____m/s(g取9.8 m/s2)
图3 图4
图5
12．物体在空中下落的过程中，重力做正功，物体的动能越来越大，为了“探究重力做
功和物体动能变化的定量关系”，我们提供了如图5的实验装置
(1)某同学根据所学的知识结合图5设计一个本实验情景的命题：如图所示，测量质量为 m的小球在重力mg作用下从开始端自由下落至光电门发生的____，通过光电门时 的__②__，探究重力做的功__③__与小球动能变化量__④__的定量关系． 请在①②空格处填写物理量的名称和对应符号； 在③④空格处填写数学表达式．
(2)某同学根据上述命题进行如下操作并测出如下数值． ①用天平测定小球的质量为0.50 kg；
②用游标卡尺测出小球的直径为10.0 mm；
③用刻度尺测出电磁铁下端到光电门的距离为80.80 cm； ④电磁铁先通电，把小球吸在下端． ⑤电磁铁断电时，小球自由下落．
－
⑥在小球经过光电门时间内，计时装置记下小球经过光电门所用时间为2.50×103 s，由 此可算得小球经过光电门的速度为______m/s
⑦计算得出重力做的功为__________J，小球动能变化量为____________J．(结果保留三 位数字)(g取10 m/s2)
(3)试根据(2)对本实验下结论：______________________________________. 三、计算题(本题共4个小题，共44分)
13．(10分)有一辆质量为800 kg的小汽车驶上圆弧半径为50 m的拱桥．(g取10 m/s2) (1)汽车到达桥顶时速度为5 m/s，汽车对桥的压力是多大？ (2)汽车以多大速度经过桥顶时便恰好对桥没有压力而腾空？
(3)汽车对地面的压力过小是不安全的．因此从这个角度讲，汽车过桥时的速度不能过 大．对于同样的车速，拱桥圆弧的半径大些比较安全，还是小些比较安全？
(4)如果拱桥的半径增大到与地球半径R一样，汽车要在地面上腾空，速度要多大？(已 知地球半径为6 400 km)
14．(10分)一颗在赤道上空飞行的人造地球卫星，其轨道半径为r＝3R(R为地球半径)， 已知地球表面重力加速度为g，则该卫星的运行周期是多大？若卫星的运动方向与地球 自转方向相同，已知地球自转角速度为ω0，某一时刻该卫星通过赤道上某建筑物的正上 方，再经过多少时间它又一次出现在该建筑物正上方？
15.(12分)如图6所示，
图6
水平放置的传送带与一光滑曲面相接(间隙很小)，一小滑块质量为m＝0.1 kg，从距离传 送带h＝0.2 m处静止滑下，传送带水平部分长l＝1.8 m，滑块与传送带间的动摩擦因数
μ＝0.1(g取10 m/s2)．
(1)使传送带固定不动，问滑块能否滑离传送带？摩擦产生的热量是多少？
(2)传送带逆时针以v2＝1 m/s匀速运动，问滑块能否滑离传送带？产生的热量是多少？
16．(12分)如图7所示，{2017步步高英语课时作业新世纪}.
图7
竖直平面内的3/4圆弧形光滑轨道半径为R，A端与圆心O等高，AD为水平面，B点在 O的正上方，一个小球在A点正上方由静止释放，自由下落至A点进入圆轨道并恰能到 达B点．求：
(1)释放点距A点的竖直高度． (2)落点C与A点的水平距离．
综合检测(二)
1．C 2.D 3.D
4．AC [当飞机做加速度的大小为重力加速度g、加速度的方向为竖直向下的运动时，座舱内的试验者便处于完全失重状态．这种运动可以是飞机模拟无阻力的竖直下抛运动或竖直上抛运动，也可以是斜抛运动，所以A正确，B错误；如果是竖直上抛运动，可计算出时间是150 s，如果是竖直下抛运动，可计算出时间是50 s，因此可得C正确，D错误．]
5．B [由速度的平行四边形，合速度是不变的，当河流的速度增大的时候，划船的速度要增大，夹角也要增大才行，所以只有B是对的．]
v2v2
6．D [在最高点，设座椅对飞行员的支持力为FN1，则mg＋FN1＝m，得FN1＝mrrmg
由牛顿第三定律，在最高点飞行员对座椅的压力大小为
v2
FN1′＝m－mg
r
在最低点，设座椅对飞行员的支持力为FN2，则
v2v2
FN2－mg＝mFN2＝mg＋
rr
由牛顿第三定律，在最低点飞行员对座椅的压力大小为
v2
FN2′＝mg＋m，
r
FN2′－FN1′＝2mg.]
7．B [开始时，该质点所受合力为恒力，所以质点从静止开始后的运动为匀加速直线运动，经过一段时间撤掉其中一个力后，质点受力仍为恒力，但力的方向与速度方向之间有夹角，且夹角为锐角，所以质点做匀变速曲线运动，故选项B正确．]
1y
8．D [设此过程经历时间为t，竖直位移y＝gt2，水平位移x＝v0t，tan θ＝t
2x
2v0tan θvygt＝，得t∝v0，故图象A、B均错．tan α＝＝＝2tan θ，得tan α与v0无关，为一恒
gx0
量，故C错，D正确．]
1
9．A [两物体位于同一高度，根据机械能守恒定律v2＝mgh，故落地时速率相等，但
2
由于两物体质量大小不确定，落地时机械能不一定相等，重力功率不一定相同．由位移公式：h1
＝gsin θt2(θ为斜面倾角)θ不同，则下滑时间不同．] sin θ2
mv21
10．C [最低点时，绳的张力F＝7mg，做圆周运动条件F－mg＝所以mv21＝6mgR. R
mv222
恰能达到最高点，则mg＝，mv2＝mgR.
R
1121
v21＝mv2＋mg2R＋W，解得克服阻力所做的功W＝.] 22211．(1)平抛运动的竖直分运动是自由落体运动 (2)0.036 0.694
12．(1)①位移x ②瞬时速度 v ③mgx 1
④v2. (2)⑥4 ⑦4.04 4.00 (3)在误差允许范围内，重力做的功与物体动能的变化2量成正比
解析 本题考查实验设计探究能力、迁移能力、分析综合能力，还考查了瞬时速度的理解．根据瞬时速度的概念，球通过光电门时的平均速度可认为等于球通过光电门时的瞬时速度．
(1)首先明确实验原理：重力做的功等于物体增加的动能．所以测量小球下落的位移x和
1
下落位移x时所对应的速度v，比较重力做的功WG＝mgx和动能的增加量ΔEk＝v2的关系
2
即可验证命题的正确性．
(2)小球经过光电门的速度可以用小球通过光电门这段很短时间内的平均速度来表示，v
－3
d10×1012＝＝－＝4 m/s；W＝mgx＝4.04 J，ΔEk＝mv＝4.00 J t2.50×102
13．(1)7 600 N (2)22.4 m/s (3)半径R大些比较安全 (4)8 000 m/s 解析 如右图所示，
2017步步高英语课时作业新世纪篇四
【步步高 学案导学设计】2014-2015学年高中英语(人教版,必修一)课时作业：Unit 2 第4课时]
Period Four Grammar & Writing
Ⅰ.句型转换
1．“Don’t forget to give the message to my wife，”he said to Li Ping.
He ________ Li Ping ________ ________ forget to give the message to ________ wife.
2．“Mum，please help me find my shirt，”he said.
He ________ his mother ________ help ________ find ________ shirt.
3．The soldier ordered，“Be quiet.”
The soldier ________ us ________________ quiet.
4．“Don’t spend too much time on football！”Mother said to me.
Mother ________ me ________ ________ ________ too much time on football.
5．“Will you sleep and get up early，children？”Father said.
Father ________ the children ________ ________ and ________ up early.
Ⅱ.翻译句子
1．这位警察告诉那些小男孩不要在街上踢足球。
________________________________________________________________________
________________________________________________________________________
2．老师命令孩子们不要制造噪音。
________________________________________________________________________
________________________________________________________________________
3．约翰说前一天他已回信告诉他这件事了。
________________________________________________________________________
________________________________________________________________________
4．彼得让我和他一起去乡村野餐。
________________________________________________________________________
________________________________________________________________________
5．妈妈嘱咐我10点以前回去。
________________________________________________________________________ Ⅲ.单项填空
1．“Don’t worry about me ，”she ______ her sister.
A．said to B．referred to C．thanks to D．spoke
2．He said to the soldiers，“Put down your guns at once.”
→He ______ the soldiers ______ down ______guns at once.
A．ordered；to put；their B．told；to put；their
C．ordered；put；your D．told；put；your
3．She told me ______ a noise in the hall.
A．don’t make B．not to make
C．make not to D．to make not
4．Martin ______ his dog to lie down under the big tree.
A．made B．had C．promised D．ordered
5．He said to his son, “Put on more clothes.”
→________
A．He told his son to put on more clothes.
B．He asked his son put on more clothes.
C．He said to his son that he would put on more clothes.
D．He told his son that he should put on more clothes.
6．He asked ______ for the computer.
A．did I pay how much
B．I paid how much
C．how much did I pay
D．how much I paid
7．“Have you seen the film？”he asked me.
→He asked me ______.
A．had I seen the film
B．have I seen the film
C．if I have seen the film
D．whether I had seen the film
8．“Please close the window，”he said to me.
→He ______ me ______ the window.
A．said to；to close B．told to；closing
C．asked；to close D．said to；please close
9．“I am a teacher，”Jack said.
→Jack said ______.
A．that I am a teacher B．I was a teacher
C．that he is a teacher D．he was a teacher
10．He said，“Mother，the boy is very naughty.”
→He _________ very naughty.
A．said his mother that the boy was
B．said to his mother that the boy is
C．told his mother that the boy was
D．spoke to his mother that the boy was
11．“You’ve already got well，haven’t you？”she asked.
→She asked me ______.
A．if I have already got well，hadn’t you
B．whether I had already got well
C．have I already got well
D．had I already got well
12．The teacher asked me________.
A．that I had finished my homework
B．that had I finished my homework
C．whether had I finished my homework
D．if I had finished my homework
13．He asked，“How are you getting along？”
→He asked me ______.
A．how am I getting along
B．how are you getting along
C．how I was getting along
D．how was I getting along
14．He asked me ______ with me.
A．what the matter is
B．what the matter was
C．what’s the matter
D．what was the matter
15．He said，“Don’t do that again.”
→He ______ me ______ that again.
A．said to; not to do B．said to; don’t do
C．told; don’t do D．told; not to do
Ⅳ.阅读理解
I’m telling Mother about a new girl in school，and she suddenly looks up and says，“Who’re your two best friends？” I’m not sure what to say.I’ve been friends with Jill since I was three