练习册

  • 练习册
  • 试题
    精英家教网 > 高中英语 > 题目详情
    Most people who work in London get a break of about an hour for lunch.  36  they mostly live too far from home to go back there  37  lunch, they have to  38  other arrangements for their midday meal.
    Many large companies have a canteen (自助食堂) for their employees. In  39  canteens the food served is simple but  40 , and there is some  41  of choice. But the number of dishes 42 usually small. The employees themselves fetch their dishes  43  a counter at which they are 44. There they can find a tray on  45  to carry their knives, forks, spoons, plates, cups, saucers, 46, of course, their food. A meal in a canteen is inexpensive and may  47  of soup, fish and chips or meat and two vegetables,  48  fruit or pudding of some  49  as dessert. Some companies that do not run a canteen  50  their staff with luncheon-vouchers (午餐券), which many restaurants will accept in 51  of money.
    As there are so many people  52  work in London, there are numerous cafes and restaurants in every area that is not purely residential. A meal  53  cost anything from a modest sum to quite a few pounds,  54  on the restaurant and the food chosen.  55 , one can generally get a meal, or at least a snack, in a pub. In recent years there has also been a big increase in the number of ‘take-away’ food shops of all kinds.
    小题1:
    A．UnlessB．AsC．IfD．Although
    小题2:
    A．forB．atC．ofD．in
    小题3:
    A．takeB．bringC．makeD．use
    小题4:
    A．suchB．fewC．soD．little
    小题5:
    A．fullB．limitedC．extraD．enough
    小题6:
    A．exchange B．varietyC．change D．difference
    小题7:
    A．areB．isC．beingD．be
    小题8:
    A．toB．withC．atD．from
    小题9:
    A．soldB．servedC．madeD．kept
    小题10:
    A．whichB．itC．exceptD．instead
    小题11:
    A．orB．butC．andD．except
    小题12:
    A．consistB．composeC．compareD．insist
    小题13:
    A．alongB．withC．aboutD．at
    小题14:
    A．sortB．patternC．categoryD．content
    小题15:
    A．prepareB．repairC．affordD．provide
    小题16:
    A．space B．caseC．faceD．place
    小题17:
    A．atB．aboveC．overD．by
    小题18:
    A．mustB．mayC．should D．could
    小题19:
    A．takingB．turningC．dependingD．bringing
    小题20:
    A．Besides B．HoweverC．NeverD．More

    小题1:B
    小题1:A
    小题1:C
    小题1:A
    小题1:D
    小题1:B
    小题1:B
    小题1:D
    小题1:B
    小题1:A
    小题1:C
    小题1:A
    小题1:B
    小题1:A
    小题1:D
    小题1:D
    小题1:A
    小题1:B
    小题1:C
    小题1:A

    小题1: B。 主句和从句是因果关系，应选择表示因果关系的连词，即"因为大多数人离家太远，所以他们被迫自己安排午餐"。as这里作"因为"讲。
    小题1:A。 注意as引导从句的too...to结构，句意：“离家太远无法回家吃午饭”，选择介词for符合此意，go back for lunch“ 回家吃午饭”。
    小题1:C。make arrangement for是固定搭配，意即："对……作安排"。
    小题1: A。 前面已经提及大公司餐厅，随即再介绍这些餐厅的情况，应该选择指示的形容词such“那样的，如此的”；如果选same，那么空格前应该有定冠词the，而且不符合上下文意思。
    小题1: D but表示转折，所填词的意思与plain“简单的”相对。食堂里面供应的饭菜多虽比较简单，但还算充足。D项adequate"充足的"正确。
    小题1:B。 variety of为固定搭配，意为"不同种类"，在这里指就餐的人可以有不同的选择；A项difference用在这里指选择不同。而文章实质是强调有不同的饭菜可供选择，而并不是强调选择的不同。
    小题1:B。 主语是number，谓语动词应使用第三人称单数。
    小题1:D。 fetch…from… 意为“从……取……”，是指就餐的人从餐桌自己拿盘子。
    小题1: B。 次空前的they指的是前文提到的employees, 此句用的是被动语态。就餐人员自己从餐桌取饭菜, 因此选择served。
    小题1:A。 简单定语从句。tray意为“托盘”，就餐的人能在托盘上（on which）放
    小题1:C 。and用于连接并列的宾语。空前列举的是餐具，空后列举的是食物，所列举的东西都是托盘上所放的东西。
    小题1:A。 consist of为固定搭配，意为"由……组成"。餐厅里的食物不贵，而且有汤，鱼和土豆条或是肉和蔬菜。
    小题1:B。 with fruit，即主食（meat and two vegetables）加上水果。
    小题1:A。 此处of与名词连用，表示具有某种性质、状态，作后置定语，a pudding of some sort as dessert意为"作为饭后甜点的某种布丁"。some sort意为"某种"。
    小题1: D。provide sb. with sth.意为“为某人提供什么东西”，没有餐厅的公司会为员工提供午餐券。
    小题1:D。 in place of意为"代替"，文中的意思是"用餐券代替现金"。
    小题1:A。 at work为固定搭配，意为"在工作中的"。为介词短语作后置定语，修饰主语people。
    小题1:B。 这里只表示一种可能性。因此选择may。一顿饭可能会花掉很少或很多的钱。
    小题1:C。depending on除了表示"依赖于"，此处表示"取决于"，这里表示"取决于选择的饭店和食物"。
    小题1: A。 后文说人们看在酒吧里也能吃顿小事。与前文在逻辑上表示递进关系，因此选择moreover“而且”。
    练习册系列答案
    年级 高中课程 年级 初中课程
    高一 高一免费课程推荐！ 初一 初一免费课程推荐！
    高二 高二免费课程推荐！ 初二 初二免费课程推荐！
    高三 高三免费课程推荐！ 初三 初三免费课程推荐！
    相关习题

    科目：高中英语 来源：不详 题型：阅读理解

    Begin doing the work you love as soon as possible, even if you don’t get paid for it, or if you can only work at it part-time. Albert Einstein was unable to get a job as a physics professor. He could have said to himself, “Well, I just don’t have the work relative to physics. I should give up on it and settle for something else.” Instead, he wrote the two most famous papers when he was employed as a patent  clerk. After their publication, there was not a major university in the world that would not have been glad to have him on their staff.
    If you want to work as an artist and you are making a living as a waiter, don’t think of yourself as a waiter who hopes one day to become an artist. That puts the work you love somewhere off in the distant future. Rather, think of yourself as an artist, supporting yourself by waiter tables—and paint, or draw as much as you can. It is possible to earn a living wage as a waiter working 24 hours a week. That leaves plenty of time to devote to training or developing your craft（手艺）in the off hours.
    While seeking the work you love, it helps to expand your awareness  into the universe of all possibilities. You don’t want to be limited to the ideas of what you should do or what you have done before. Having opened to all possibilities, you can make a final decision and select the work you love as your own.
    Doing the work you love requires that you be equally comfortable with the imaginative and the practical. It requires the ability to dream big dreams and the ability to face and master all the little details that make dreams come true.
    小题1:According to the passage, perhaps Einstein once said to himself, “_______.”
    A．Well, I just don’t have the work relative to physics. I should give up on it and settle for
    something else
    B．The job is just what I want, I should work very hard at it
    C．I have to support myself by working as a patent clerk now, but I won’t give physics up
    D．I must wait until I find my favorite job
    小题2:If a person works 24 hours a week, he can________.
    A．have enough spare time for his hobbies
    B．have no time left to make his dream come true
    C．do nothing else
    D．make a good living
    小题3:Which of the following is not implied in the last paragraph?
    A．Sometimes the imaginative is different from the practical.
    B．We have to take care of a lot of details before we make our dreams come true.
    C．We shall do practical things rather than dream.
    D．We shall dream big dreams and practice as well.
    小题4:According to the passage, the author encourages us to ________.
    A．start work quickly B．select job carefully and patiently
    C．dream oftenD．make up our minds quickly

    查看答案和解析>>

    科目：高中英语 来源：不详 题型：完形填空

    I am a single mom and have a child. Knowing that I could not __21__ to get him anything at all for his birthday, I felt broken-hearted. __22__ I decided to post a(n) __23__ on “Wish Upon A Hero” website for people to __24__ my son birthday cards. I knew he loved to __25__ the mailbox and always asked if there was anything for him. I __26__ that if he could get a few cards, it would make him smile and maybe, just maybe, he wouldn't be so __27__ that I wasn't able to get him anything. The cards just started __28__ in and my little sweetie was __29__ excited! Every day more and more cards came and this went__30__ for about three weeks. The smile on his face and the sparkle in his eyes brought me to __31__. At the end of November, he started thinking about Christmas and he __32__ knew that there would not be much under the tree for him due to my __33__，but it didn't seem to __34__ to him. All he talked about was how much he wanted to make other children __35__. He decided that what he wanted to do was earn money to buy Christmas cards and send them to other children from __36__ families. My son went out daily to make money. Not only did he make the money to buy the cards, but he also made enough money to buy all the stamps and lollipops (棒棒糖) to put in the __37__. He sent out about 100 cards. Doing this __38__ him the same smile and sparkle in his eyes as the birthday cards that he had received did. I was and am so __39__ of him. My son and “Wish Upon A Hero” have given me renewed __40__ that there are still people in this world that care about others.
    小题1:
    A．agreeB．pretendC．expectD．afford
    小题2:
    A．InsteadB．HoweverC．SoD．Besides
    小题3:
    A．pictureB．jobC．wishD．advertisement
    小题4:
    A．showB．sellC．designD．send
    小题5:
    A．checkB．produceC．addressD．receive
    小题6:
    A．explainedB．thoughtC．regrettedD．promised ．
    小题7:
    A．angryB．curiousC．upsetD．strange
    小题8:
    A．breakingB．happeningC．pouringD．improving
    小题9:
    A．absolutelyB．eventuallyC．generouslyD．attentively
    小题10:
    A．awayB．offC．upD．on
    小题11:
    A．surpriseB．difficultyC．respectD．tears
    小题12:
    A．alreadyB．stillC．evenD．never
    小题13:
    A．supportB．strengthsC．financesD．instructions
    小题14:
    A．matterB．objectC．belongD．refer
    小题15:
    A．understandB．changeC．continueD．smile
    小题16:
    A．ordinaryB．poorC．familiarD．distant
    小题17:
    A．mailboxB．houseC．cardsD．stamps
    小题18:
    A．savedB．broughtC．owedD．taught
    小题19:
    A．proudB．carefulC．awareD．full
    小题20:
    A．excuseB．suggestionC．doubtD．hope

    查看答案和解析>>

    科目：高中英语 来源：不详 题型：阅读理解

    She is quiet, soft-spoken and has a kind face and a strong heart. She is my mom, Lili.
    When I was nine, Lili quitted her job and started her own business. She said she didn’t want to stay at home and work as a housewife: “It’s a waste of life.” Lili became so busy that she spent less and less time with me. She didn’t help me with my schoolwork. It was, in her words, “so that you can develop your independence”. We quarreled because she rarely showed up at parents’ meetings.
    Like mother, like daughter. I have many things in common with Lili. I want everything to be under control. I want to be perfect and I don’t expect other people to help me. I push myself hard to achieve my goals.
    After I started to go to high school, Lili and I were too busy to communicate much with each other.
    In biology class I began to be depressed. When the teacher showed us a picture of a butterfly, I was scared and screamed. I had a vision of thousands of butterflies flying toward me.
    That night I told Lili about it. The next morning, I saw that she had red eyes with black circles around them.
    She took me to see a therapist (治疗师). Three hours later, the therapist told Lili that my life was like a wheel spinning (旋转) faster and faster and that was the reason for what had happened to me. I only realized it when my body couldn’t stand the pressure anymore. At these words, Lili burst into tears. “It’s all my fault, she’s just a kid and I didn’t have time to take care of her….”  To be honest, I had never seen Lili cry before.
    After that, Lili began to spend more time at home, cooking and dragging me to do sports. I realized she was the one who would always be there when I was in real trouble. No mom is perfect, but she is the one who really cares about her kid.
    小题1:Lili quitted her job and started her own business because _________.
    A．she wanted to make more moneyB．she was not willing to look after me
    C．she didn’t want to waste her lifeD．she likes keeping busy
    小题2: We quarreled because __________.
    A．she began to spend less and less time with me
    B．she didn’t help me with my schoolwork.
    C．she seldom attended the parents’ meetings in my school.
    D．Lili and I were too busy to communicate much with each other.
    小题3:What can we learn from the passage?
    A．Most women don’t want to be a housewife.
    B．Most children want their mothers to accompany them at home.
    C．We need to understand our mothers’ busy life.
    D．Although mothers are not perfect, they all love the children
    小题4: Which of the following statements is WRONG?
    A．Lili is a quiet, strong-willed woman.
    B．Lili began to spend more time at home after visiting the therapist.
    C．I was scared and screamed in biology class because I hate butterflies.
    D．I only realized my life was like a wheel when my body couldn’t stand the pressure anymore.
    小题5: What is the best title for the passage?
    A．Mom Does Care.B．A Busy but Successful Mother.
    C．Change From Mother to Businessman.D．A Student’s Opinion on Mother.

    查看答案和解析>>

    科目：高中英语 来源：不详 题型：完形填空

    I devote myself to music because of my grandmother. My mom and I lived with my grandparents from the time I was two __36__ I was eight. And even then, I was at their house before and after school every day while my mother was __37__.
    Grandma loved music. It was she that first __38__ me to Elvis Presley (猫王) as a very young child, and once I heard his music, I was truly in __39__ with it. Most five-year-olds ask for __40__ for birthdays, but I wanted Elvis’ albums. I would play them non-stop and __41__ to the music in my grandma’s family room though my movements didn’t look good.
    Grandma played the piano and __42__ me to sing “America the Beautiful” and “Somewhere over the Rainbow”. I __43__ started playing music on the piano, and soon Grandma was paying for me to __44__ piano lessons from a lady living in the __45__. I would come home from __46__ and walk three houses down for my lesson. I __47__ took about nine months of lessons, but it was enough to give me a foundation (基础) and __48__ me to continue to teach myself.
    Last month when I came home to visit Grandma in the hospital, I __49__ my guitar with me. She was in a lot of pain, but the music seemed to __50__ her soul. She had me sing some songs and when I started to sing “Somewhere over the Rainbow”, her weakened voice __51__ in with mine for a few lines. That experience was one of the most __52__ of my lifetime and one I will certainly cherish forever. I told her of my music career and she was very __53__ and said, “That’s wonderful!” I __54__ to play for her throughout the week I was home.
    My grandma passed away two days ago. In my opinion, part of her will live on through every __55__ I write or sing in my life.
    小题1:
    A．unlessB．untilC．afterD．when
    小题2:
    A．at workB．in troubleC．on boardD．in danger
    小题3:
    A．sentB．leftC．rememberedD．introduced
    小题4:
    A．debateB．loveC．agreementD．doubt
    小题5:
    A．musicB．spaceC．giftsD．toys
    小题6:
    A．waveB．sleepC．danceD．play
    小题7:
    A．forcedB．preparedC．enabledD．taught
    小题8:
    A．generallyB．eventually(最后)C．suddenlyD．fortunately(幸运地)
    小题9:
    A．observeB．makeC．takeD．enjoy
    小题10:
    A．hotelB．apartmentC．neighborhoodD．countryside
    小题11:
    A．schoolB．hospitalC．streetD．office
    小题12:
    A．exactlyB．onlyC．completelyD．seldom
    小题13:
    A．askB．makeC．letD．allow
    小题14:
    A．gave upB．gave awayC．brought alongD．brought up
    小题15:
    A．comfortB．blameC．attractD．find
    小题16:
    A．joinedB．pouredC．movedD．fell
    小题17:
    A．surprisingB．touchingC．puzzlingD．tiring
    小题18:
    A．sadB．calmC．boredD．pleased
    小题19:
    A．refusedB．expectedC．continuedD．pretended (假装)
    小题20:
    A．projectB．articleC．bookD．song

    查看答案和解析>>

    科目：高中英语 来源：不详 题型：阅读理解

    It seems that some people go out of their way to get into trouble．That’s more or less what happened the night that Nashville Police officer Floyd Hyde was on duty.
    “I was on the way to a personal-injury accident in West Nashville．As I got onto  Highway 40，blue lights and sirens(警笛)going.I fell in behind a gold Pontiac Firebird that suddenly seemed to take off quickly down the highway．The driver somehow panicked at the sight of me．He was going more than a hundred miles an hour and began passing cars on the shoulder．”
    But Hyde couldn’t go after him．Taking care of injured people is always more important than worrying about speeders，so the officer had to stay on his way to the accident．But he did try to keep the Firebird in sight as he drove，hoping another nearby unit would be able to step in and stop the speeding car．As it turned out，keeping the Firebird in sight was not that difficult．Every turn the Pontiac made was the very turn the officer needed to get to the accident scene.
    Hyde followed the Pontiac all the way to his destination(目的地)．At that point he found another unit had already arrived at the accident scene．His help wasn’t needed.Now he was free to try to stop the driver of the Firebird，who by this time had developed something new to panic about．
    “Just about that time，” Hyde said，“I saw fire coming out from under that car，with blue smoke and oil going everywhere.He’d blown his engine．Now he had to stop．”
    “After I arrested him．I asked him why he was running．He told me he didn’t have a driver’s license(执照)．”
    That accident cost the driver of the Firebird plenty---a thousand dollars for the new engine---not to mention the charges for driving without a license，attempting to run away，and dangerous driving．
    小题1:The underlined word“panicked”in Paragraph 2 means       .
    A．fearedB．hatedC．excitedD．satisfied
    小题2:The driver of the Firebird suddenly speeded down the highway because         .
    A．he was racing with another driver on the road
    B．he realized he had to hurry to the accident scene
    C．he thought the police officer wanted to stop him
    D．he wanted to overtake other cars on the shoulder
    小题3:Which of the following statements is true?
    A．Someone else was taking care of the injured person．
    B．The Pontiac reached its destination at the accident scene．
    C．Hyde knew where he was going by following the right car．
    D．The policeman was running after a speeder on Highway 40
    小题4:Choose the best title for the passage．
    A．Going My Way?B．Help on the Way?
    C．Fun All theWay?D．Losing His Way?

    查看答案和解析>>

    科目：高中英语 来源：不详 题型：阅读理解

    You probably know you should say “please” and “thank you” at restaurants. You probably know the rules of a library. You know you should respect and be nice to your classmates. But do you have music manners?
    Keep It Down! You have to notice the volume of your music. You should not play your music so loud that everyone around you can hear it. Some people might even get angry. Usually, when you play the music loud on an MP3 player, other people can’t hear the words of the song. They just hear a loud sound. No one wants to listen to this. Very loud music can also be bad for your ears. So even if you are alone when listening to our MP3 players, you shouldn’t turn it up too high.
    Take Them Off! You need to know when to turn your MP3 off and put it away. Libraries, and schools don’t allow MP3 players. There are other places, like museums, that don’t have rules, but it would be rude to have your MP3 player on. Sometimes, it doesn’t make sense to listen on your MP3 player at event. Why would you listen to music at a play, a movie or a sporting event? You would miss what is going on and others would wonder why you even came.
    Take One Out! Once in a while it’s okay just to take out one earphone and not other. Imagine you are listening on your MP3 player when someone asks you the way. It would not be rude to take out one earphone, tell him the way, and put back the earphone and continue listening. You can also do this when you order food at a fast-food restaurant or when you answer the telephone and it’s not for you.
    It’s Your Choice! There are times when you need to decide what is best. For example, some people can listen to music on their MP3 players when reading books, while others think it is disturbing. In cases like this, you need to do what seems right for you.
    小题1:The underlined word “volume” in Paragraph Two probably means “_________.”
    A．the type of musicB．the amount of a sound
    C．the length of a songD．the colour of an MP3 player
    小题2:No one wants to listen to_________from others’ MP3 players.
    A. a loud sound     B. sad stories    
    C. a long movie      D. the words of a song
    43. We should turn down the music when we are alone because loud music_________.
    A. is not enjoyable      B. makes us tired  
    C. is bad for MP3 players  D. hurts our ears
    小题3: If we listen to our MP3 player at a play, _________.
    A．the theatre won’t allow itB．the actors will get angry
    C．others won’t hear the play wellD．we will miss part of the play
    小题4:We can take one earphone out when we _________.
    A．show others the wayB．talk to friends on the phone
    C．watch a sporting eventD．have dinner with our parents

    查看答案和解析>>

    科目：高中英语 来源：不详 题型：阅读理解

    My basketball coach at Princeton used to say, "On the court, you can tell who is selfish(自私的)."
      　When my sister Michelle brought Barack Obama home to meet the family, she said to me, "I want you to take him out to play, to see what type of man he is when he’s not around me." So I invited Barack to play basketball with a few friends of mine.
      　I was very nervous although I had already met Barack a few times. I was thinking this guy seemed like a good guy. We played a hard five-on-five. He was thin but not weak. He played extremely left-handed. He dealt with everything perfectly. He wasn’t the best guy out there or the worst guy. I liked the fact that he was confident but wasn’t proud. Barack was very team-oriented (有团队精神的), very unselfish. He played as if he was one of us —he wasn’t trying to be president of Harvard Law Review. But the best part about it was that when we were on the same team, he did not pass me the ball each time. He wasn’t trying to suck up to my sister through me. I was glad to give my sister the good news, "Your boy is straight."
      　He isn’t selfish, which is the greatest praise you can give both a player and a leader. America has got a guy who is running a government in an efficient (有效率的) manner. That’s the same guy I got to know playing basketball when he was visiting my family.
    小题1: Why does the author begin the passage with his coach’s words?
    A．He wants to remember and thank his coach.
    		B．He wants to show that he is a basketball player.
    		C．He wants to tell his sister about the words.
    		D．He wants to use the words to test a person.
    小题2:Why did Michelle ask the author to take Barack to play basketball?
    A．To see whether he was confident.
    		B．To see whether he was good at sports.
    		C．To see whether he was selfish or not.
    		D．To see whether he could get along with others.
    小题3:During the basketball game, Barack ______.
    A．played best all the timeB．was strong enough to play
    		C．was not confidentD．wanted to be the team leader
    小题4: The underlined phrase in the third paragraph can be replaced by "______".
    A．please （使满意）B．know aboutC．helpD．look for

    查看答案和解析>>

    科目：高中英语 来源：不详 题型：阅读理解

    When you do some minor image editing (修正) on your computer screen, you may make some mistakes, so from time to time you’d click undo (撤消).
    There are things in life we cannot undo as easily and completely as we would with our computer files. A wrong turn, a hurtful word said to a loved one, a bad move — these we all commit as we walk our life’s journeys, no matter how careful we are in our steps. Once committed, we can no longer undo many of these mistakes, especially because unlike with our computer documents, each thing we do and say has vast impact as they involve not just us — the file that we are working on — but also others, the unopened files and computer programs in our system.
    So I guess our life’s mistakes are not like our pencil scrawls (潦草书写) that can be effectively corrected with an eraser, or errors on our computer works that can be undone with an undo button. But there are effective and reliable tools we can use—APOLOGY and FORGIVENESS. Simply click the APOLOGY button when you have committed a mistake that has hurt a loved one and the words “I’m Sorry” will flash on the other person’s screen. But, you have to be truly sorry and you must be prepared not to commit the same mistake again for your APOLOGY to work. Sincerity is definitely a necessary part.
    When someone clicks the APOLOGY button and the words “I’m sorry” flash on your screen, all you have to do is click back the FORGIVENESS (原谅) button. It means that you have wholeheartedly accepted the other person’s APOLOGY. But not only that. You also have to click it when someone has sent you back the message “It’s okay. Forget about it.”. It means that you are also forgiving yourself for your mistake; that you won’t keep feeling so bad having committed it.
    And lastly, don’t forget to keep clicking the SAVE button. Going through the whole process of editing—of doing and undoing, of apologizing and forgiving — is useless if you fail to save the LESSON for future use. Let the saved file be a reminder of the healing process you once went through to make yourself better; for you not to forget the lesson; and for others to access and learn from.
    小题1:Which of the following is TRUE?
    A．However careful we are, we still make mistakes in life.
    B．Things we do and say can affect computer programs in our system.
    C．We can undo life’s mistakes if we are careful enough.
    D．An eraser is an effective tool for our computer works.
    小题2: The APOLOGY button should be clicked when ________.
    A．one wants to make the computer work perfectly
    B．one’s mistakes won’t influence others any more
    C．one is actually saying “I’m sorry”
    D．one won’t make the same mistake again
    小题3:What does the underlined word “it” in Paragraph 4 refer to?
    A．The UNDO button.B．The APOLOGY button.
    C．The SAVE button.D．The FORGIVENESS button.
    小题4:We need to click the SAVE button in life because ________.
    A．we want to go through the whole process of editing
    B．we need to learn a lesson from the past mistakes
    C．we want to make the healing process faster
    D．we need to use the computer properly

    查看答案和解析>>

    同步练习册答案