When I was a child my father taught me five words that I've used all my life- in my acting career,as a mother,in my business activities.If I _______ that I was afraid of the dark,or if I seemed worried about meeting new people,Dad would say, ＂Stand porter to your_______."
A porter is a gatekeeper,who stands at a door _______ people in or out.Dad would get me to _______myself stopping destructive things--such as fear-at the door,_______ saying“Come in"to faith,love and self-assurance.
As an actress,before I went on camera,I'd make sure anxiety_______ and confidence in my ability came in.As a mother,when I was _______about my children, I would try not to let worry in but would _______my mind with trust in them.
Of course,there were always times I'd_______ those words.
In 1972 my husband,Fillmore Crank,and I opened the doors to our own ________in North Hollywood.This was a new business venture for us,and it was a lot more ________and complicated than we had ________.
We were on call 24 hours a day.Something was always going ________. Electricity went on the blink,food wasn't delivered,employees called in sick.Once, a flu epidemic ________ left us with no maids.Fillmore gave me a ________:scrub floors or do the laundry.For 10 days I folded enough king-size sheets to________ the whole state of California.
Then there was the________ crisis.The price of gasoline doubled,and tourism in California ________.How could we fill our beds?What if we kept losing money? What if we failed?Fear and worry were sneaking in.But I caught them just ________.I stood porter.
I stood in the door of my mind and sent fear packing.
These days at the hotel,whenever fear tries to________,I just smile and point to the sign that reads No Vacancy.
1.A.complained B.announced C.recalled D.decided
2.A.future B.find C.family D.studio
3.A.letting B.urging C.inviting D.observing
4.A.busy B.involve C.send D.picture
5.A.so B.for C.but D.or
6.A.showed up B.stayed out C.cut in D.broke down
7.A.serious B.curious C.anxious D.cautious
8.A.fill B.change C.read D.ease
9.A.eat B.twist C.exchange D.forget
10.A.clinic B.hotel C.laundry D.restaurant
11.A.promising B.demanding C.convincing D.boring
12.A.figured B.confirmed C.deduced D.suggested
13.A.sour B.missing C.wrong D.pale
14.A.hardly B.regularly C.specially D.suddenly
15.A.warning B.command C.choice D.solution
16.A.serve B.touch C.decorate D.blanket
17.A.credit B.energy C.identity D.family
18.A.ceased B.recovered C.dropped D.boomed
19.A.in time B.on purpose C.at random D.by chance
20.A.split B.shelter C.withdraw D.register
高三英语完形填空中等难度题
When I was a child my father taught me five words that I've used all my life- in my acting career,as a mother,in my business activities.If I _______ that I was afraid of the dark,or if I seemed worried about meeting new people,Dad would say, ＂Stand porter to your_______."
A porter is a gatekeeper,who stands at a door _______ people in or out.Dad would get me to _______myself stopping destructive things--such as fear-at the door,_______ saying“Come in"to faith,love and self-assurance.
As an actress,before I went on camera,I'd make sure anxiety_______ and confidence in my ability came in.As a mother,when I was _______about my children, I would try not to let worry in but would _______my mind with trust in them.
Of course,there were always times I'd_______ those words.
In 1972 my husband,Fillmore Crank,and I opened the doors to our own ________in North Hollywood.This was a new business venture for us,and it was a lot more ________and complicated than we had ________.
We were on call 24 hours a day.Something was always going ________. Electricity went on the blink,food wasn't delivered,employees called in sick.Once, a flu epidemic ________ left us with no maids.Fillmore gave me a ________:scrub floors or do the laundry.For 10 days I folded enough king-size sheets to________ the whole state of California.
Then there was the________ crisis.The price of gasoline doubled,and tourism in California ________.How could we fill our beds?What if we kept losing money? What if we failed?Fear and worry were sneaking in.But I caught them just ________.I stood porter.
I stood in the door of my mind and sent fear packing.
These days at the hotel,whenever fear tries to________,I just smile and point to the sign that reads No Vacancy.
1.A.complained B.announced C.recalled D.decided
2.A.future B.find C.family D.studio
3.A.letting B.urging C.inviting D.observing
4.A.busy B.involve C.send D.picture
5.A.so B.for C.but D.or
6.A.showed up B.stayed out C.cut in D.broke down
7.A.serious B.curious C.anxious D.cautious
8.A.fill B.change C.read D.ease
9.A.eat B.twist C.exchange D.forget
10.A.clinic B.hotel C.laundry D.restaurant
11.A.promising B.demanding C.convincing D.boring
12.A.figured B.confirmed C.deduced D.suggested
13.A.sour B.missing C.wrong D.pale
14.A.hardly B.regularly C.specially D.suddenly
15.A.warning B.command C.choice D.solution
16.A.serve B.touch C.decorate D.blanket
17.A.credit B.energy C.identity D.family
18.A.ceased B.recovered C.dropped D.boomed
19.A.in time B.on purpose C.at random D.by chance
20.A.split B.shelter C.withdraw D.register
高三英语完形填空中等难度题查看答案及解析
When I was a child my father taught me five words that I’ve used all my life—in my acting career, as a mother, in my business activities. If I _______ that I was afraid of the dark, or if I seemed worried about meeting new people, Dad would say, “Stand porter to your _______.”
A porter is a gatekeeper, who stands at a door _______ people in or out. Dad would get me to _______ myself stopping destructive things—such as fear—at the door, _______ saying “Come in” to faith, love and self-assurance.
As a(n) _______, before I went on camera, I’d make sure anxiety stayed out and confidence in my ability came in. As a mother, when I was _______ about my children, I would try not to let worry in but would _______ my mind with trust in them.
Of course, there were always times I’d _______ those words.
In 1972 my husband, Fillmore Crank, and I opened the doors to our own __________ in North Hollywood. This was a new business venture for us, and it was a lot more __________ and complicated than we had __________.
We were on call 24 hours a day. Something was always going __________. Electricity went on the blink, food wasn’t delivered, employees called in sick. Once, a flu epidemic __________ left us with no maids. Fillmore gave me a __________: scrub floors or do the laundry. For 10 days I folded enough king-size sheets to __________ the whole state of California.
Then there was the __________ crisis. The price of gasoline doubled, and tourism in California __________. How could we fill our beds? What if we kept losing money? What if we failed? Fear and worry were sneaking in. But I caught them just __________. I stood porter.
I stood in the door of my mind and sent fear packing.
These days at the hotel, whenever fear tries to __________, I just smile and point to the sign that reads No Vacancy.
1.A.complained B.announced C.recalled D.decided
2.A.future B.find C.family D.studio
3.A.letting B.urging C.inviting D.observing
4.A.busy B.involve C.send D.picture
5.A.so B.and C.but D.or
6.A.official B.actress C.maid D.manager
7.A.serious B.curious C.anxious D.cautious
8.A.fill B.change C.read D.ease
9.A.eat B.twist C.exchange D.forget
10.A.clinic B.hotel C.laundry D.restaurant
11.A.promising B.demanding C.convincing D.boring
12.A.figured B.confirmed C.deduced D.suggested
13.A.sour B.missing C.wrong D.pale
14.A.hardly B.regularly C.specially D.suddenly
15.A.warning B.command C.choice D.solution
16.A.serve B.touch C.decorate D.blanket
17.A.credit B.energy C.identity D.family
18.A.ceased B.recovered C.dropped D.boomed
19.A.in time B.on purpose C.at random D.by chance
20.A.split B.shelter C.withdraw D.register
高三英语完形填空中等难度题查看答案及解析
When I was a child, my parents taught me the difference between good and bad behavior by showing me specific examples. My mother told me that you don’t 36 other kids because you would not like 37 if they hit you. That makes 38 . But, if my mother told me to be “nice” to someone, it was too vague for me to 39 . But if she said that being nice ________ 40 delivering daffodils to a next door neighbor, that I could understand.
I believe that doing practical things can 41 the world a better place. When I was in my twenties I thought a lot about the meaning of life. At the time, I was getting started in my 42 of designing more humane facilities for animals at big farms and slaughterhouses(屠宰场). Many people would think that to even work at a slauterhouse would be inhumane, but they 43 that every human and animal 44 dies. In my mind, I had a(n) 45 of a way to make tht dying as 46 as possible.
Back in the 1970s, I went to fifty different feedlots and big farms in Arizona and Texas and 47 them work cattle. I cataloged the parts of each facility that 48 effectively. I took the best loading ramps, and other components and 49 them into an ideal new system. I get great 50 when a farmer tells me that my corral (畜栏)51 helps cattle move through it quietly and 52 . When cattle stay calm, it means they are not scared. And that makes me feel I’ve 53 something important.
Some people might think if I could snap my 54 I’d choose to be “normal”. But, I wouldn’t want to give up my 55 to see in beautiful, precise pictures. I believe in them.
1.A. knock B. hit C. beat D. strike
2.A. this B. which C. it D. that
3.A. sense B. difference C. sail D. way
4.A. recognize B. realize C. know D. understand
5.A. meant B. minded C. missed D. admitted
6.A. give B. turn C. make D. take
7.A. job B. career C. trade D. industry
8.A. regret B. remember C. forgive D. forget
9.A. constantly B. eventually C. immediately D. directly
10.A. description B. scene C. picture D. image
11.A. peaceful B. calm C. quiet D.silent
12.A. required B. asked C. promised D. helped
13.A. solved B. worked C. acted D. conducted
14.A. collected B. gathered C. assembled D. met
15.A. satisfaction B. expectation C. explanation D. presentation
16.A. aim B. intention C. plan D. design
17.A. hardly B. difficultly C. easily D. happily
18.A. reached B. accomplished C. adapted D. polished
19.A. fingers B. hands C. arms D. feet
20.A. skill B. possibility C. talent D. ability
高三英语完型填空中等难度题查看答案及解析
Alice’s mother died when Alice was five years old. Alice, who grew up to be my mother, told me that after her mother’s death her family was too poor to even afford to give her a doll.
In December 2012, I had a job at a local bank. One afternoon, we were decorating the tree in the bank lobby(大厅). One of my customers approached me with her beautiful handmade dolls. I decided to get one for my daughter, Katie, who was almost five years old. Then I had an idea. I asked my customer if she could make me a special doll for my mother—one with gray hair and spectacles(眼镜): a grandmother doll. And she gladly agreed.
A friend had told me that his dad who played Santa Claus would be willing to make a visit on Christmas morning to our home to deliver my Katie her presents, so I made some special arrangements.
Christmas Day arrived and at the planned time; so did Santa Claus. Katie was surprised that Santa had come to see her at her own house. As Santa turned to leave, he looked once more into his bag and found one more gift. As he asked who Alice was, my mother, surprised at her name being called, indicated that she in fact was Alice. Santa handed her the gift, with a message card that read:
For Alice:
I was cleaning out my sleigh(雪橇) before my trip this year and came across this package that was supposed to be delivered on December 25,1953. The present inside has aged, but I felt that you might still wish to have it. Many apologies for the lateness of the gift.
Love,
Santa Claus
My mother’s reaction was one of the most deeply emotional scenes I have ever seen. She couldn’t speak but only held the doll she had waited fifty-nine years to receive as tears of joy ran down her cheeks. That doll, given by “Santa”, made my mother the happiest “child” that Christmas.
1.The reason why the writer’s mother couldn’t have a doll when young was that_________.
A. Santa Clause forgot to deliver the doll to her
B. her daughter couldn’t make a doll by herself
C. her parents left the doll in the Santa Clause’s sleigh
D. her family was badly off when she was a child
2.It can be inferred from the passage that __________.
A. the writer’s father played the Father Christmas
B. the writer’s mother was already in her sixties when she received the doll
C. the writer asked one of her friends to make the doll for her mother
D. the Santa Clause was too careless to deliver the doll on time
3.When the writer’s mother received the doll that she had waited so long, she was __________.
A. pleased and inspired B. puzzled and angry
C. happy and excited D. curious and grateful
4.The best title for this passage could be __________.
A. A Doll from Santa B. An unforgettable Christmas
C. A considerate daughter D. A help from Santa Claus
高三英语阅读理解中等难度题查看答案及解析
When I was a boy my father told me that he could do anything he wanted to．Dad said that he wanted to be the first to develop color prints in our city．and so he did．
When I was 16，dad looked closely at the violin I played and said that he wanted to make one．He read about violinmaking，and then became a violinmaker at the age of 43．He bought the tools and materials，opened a small store and set Mom up as the shopkeeper，while he worked at a local company．He retired from the company 17 years later and continued to make violins and other instruments．
Dad often guessed why the Stradivarius violins sounded so beautiful．Some experts told him that it was the special varnish(油漆)that gave the instruments their beautiful sound．Dad argued that chemists could analyze the varnish—if that was the answer．
One of Dad’s friends asked him which kind of wood was used to make violins．When dad explained that the top was made of spruce(云杉)，his friend said that he had all old piece of spruce which dad might be interested in．
He worked for the next 12 months making a violin from the wood that his friend had given him．It proved to be an excellent violin and it would become Dad’s masterpiece．He believed that the secret of the Stradivarius sound was in the wood itself．
Later, the instrument was stolen． Dad’s spirit was broken and he stopped making instruments. But he kept the music shop until he was 80 years old，selling guitars and violins．
The violin has been missing for more than 25 years．Somewhere a musician is playing a late-20th-century violin with an excellent tone．The owner today may never understand why this Ordinary-looking violin sounds so much like Stradivarius．
1.In Paragraph l，the writer mentioned his father's developing color prints to ．
A．let others know that he believed his father
B．show that his father would like to make violins
C．prove that his father could do anything he wanted to
D．give an example showing that his father was an inventor
2.What did the writer's father think about Stradivarius violins?
A．They were made by experts．
B．The wood of the violins was special．
C．The way of making them was unusual．
D．The varnish was different from the others．
3.From the underlined sentence，we learn that the writer's father ．
A．found another new job
B．wanted to become famous
C．lost interest in instruments
D．liked the violin very much
4.What could be the best title of the passage?
A．My Experienced Father
B．My Father and His Violin
C．The Secret of Making Violins
D．The New Owner of the Violin
高三英语阅读理解中等难度题查看答案及解析
When I was a boy my father told me that he could do anything he wanted to．Dad said that he wanted to be the first to develop color prints in our city, and so he did．
When I was 16，dad looked closely at the violin I played and said that he wanted to make one．He read about violinmaking，and then became a violinmaker at the age of 43．He bought the tools and materials，opened a small store and set Mom up as the shopkeeper，while he worked at a local company．He retired from the company 17 years later and continued to make violins and other instruments．
Dad often guessed why the Stradivarius violins sounded so beautiful．Some experts told him that it was the special varnish(油漆)that gave the instruments their beautiful sound．Dad argued that chemists could analyze the varnish—if that was the answer．
One of Dad’s friends asked him which kind of wood was used to make violins．When dad explained that the top was made of spruce(云杉)，his friend said that he had all old piece of spruce which dad might be interested in．
He worked for the next 12 months making a violin from the wood that his friend had given him．It proved to be an excellent violin and it would become Dad’s masterpiece．He believed that the secret of the Stradivarius sound was in the wood itself．
Later, the instrument was stolen． Dad’s spirit was broken and he stopped making instruments. But he kept the music shop until he was 80 years old，selling guitars and violins．
The violin has been missing for more than 25 years．Somewhere a musician is playing a late-20th-century violin with an excellent tone．The owner today may never understand why this Ordinary-looking violin sounds so much like Stradivarius．
1.In Paragraph l，the writer mentioned his father's developing color prints to ．
A．let others know that he believed his father
B．show that his father would like to make violins
C．prove that his father could do anything he wanted to
D．give an example showing that his father was an inventor
2.What did the writer's father think about Stradivarius violins?
A．They were made by experts．
B．The wood of the violins was special．
C．The way of making them was unusual．
D．The varnish was different from the others．
3.From the underlined sentence，we learn that the writer's father ．
A．found another new job
B．wanted to become famous
C．lost interest in instruments
D．liked the violin very much
4.What could be the best title of the passage?
A．My Experienced Father
B．My Father and His Violin
C．The Secret of Making Violins
D．The New Owner of the Violin
高三英语阅读理解中等难度题查看答案及解析
When I was a boy my father told me that he could do anything he wanted to. Dad said that he wanted to be the first to develop color prints in our city and so he did．
When I was 16，Dad looked closely at the violin I played and said that he wanted to make one．He read about violin-making, and then became a violin-maker at the age of 43. He bought the tools and materials, opened a small store and set Mom up as the shopkeeper, while he worked at a local company. He retired from the company 17 years later and continued to make violins and other instruments.
Dad often guessed why the Stradivarius violins sounded so beautiful. Some experts told him that it was the special varnish(油漆)that gave the instruments their beautiful sound．Dad argued that chemists could analyze the varnish—if that was the answer．
One of Dad’s friends asked him which kind of wood was used to make violins．When Dad explained that the top was made of spruce(云杉), his friend said that he had all old piece of spruce which Dad might be interested in.
He worked for the next 12 months making a violin from the wood that his friend had given him. It proved to be an excellent violin and it would become Dad’s masterpiece. He believed that the secret of the Stradivarius sound was in the wood itself.
Later, the instrument was stolen, Dad’s spirit was broken and he stopped making instruments. But he kept the music shop until he was 80 years old, selling guitars and violins.
The violin has been missing for more than 25 years．Somewhere a musician is playing a late-20th-century violin with an excellent tone．The owner today may never understand why this Ordinary-looking violin sounds so much like Stradivarius．
1.In Paragraph l，the writer mentioned his father’s developing color prints to .
A. let others know that he believed his father
B. show that his father would like to make violins
C. Prove that his father could do anything he wanted to
D. give an example showing that his father was an inventor
2.What did the writer’s father think about Stradivarius violins?
A. They were made by experts．
B. The wood of the violins was special．
C. The way of making them was unusual．
D. The varnish was different from the others．
3.From the underlined sentence, we learn that the writer’s father ．
A. found another new job
B. wanted to become famous
C. lost interest in instruments
D. liked the violin very much
4.What could be the best title of the passage?
A. My Experienced Father
B. My Father and His Violin
C. The Secret of Making Violins
D. The New Owner of the Violin
高三英语阅读理解中等难度题查看答案及解析
When I was twelve years old, my father took me to see Zig Zigler. I remember sitting in that dark hall listening to Mr. Zigler everyone’s spirits up to the ceiling. I left there feeling like I could do anything. When we got to the car，I my father and said, “Dad，I want to people feel like that.” My father asked me what I meant. I said to him, “I want to be a speaker just like Mr. Zigler,” I replied . A dream was born.
Recently, I began seeking my dream of motivating others. a four-year relationship with Fortune 100 Company as a sales-trainer and ending as a regional sales manager，I left the company at the height of my career. Many people were that I would leave after earning a six-figure income. And they asked I would risk everything for a dream.
I made my to start my own company and leave my secure position after a regional sales meeting. The vice-president of our company delivered a that changed my life. He asked us. “If a god would you three wishes，what would they be?”After giving us a moment to write down the three wishes，he then asked us，“Why do you need a ?”I would never forget the I felt at that moment. I realized that everything I had in the past had prepared me for this moment. I was and didn’t need a god’s help to become a motivational speaker. A motivational speaker was born.
Having made that decision, I was immediately . One week after I gave notice, my husband was laid off from his job, and now we had no . But I held fast to my dream. The wonder really began to happen. In a short time my husband found a better job. And I was able to book several engagements with new customers. I discovered the incredible power of dreams.
1.A. rise B. throw C. put D. raise
2.A. turned to B. tended to C. turned down D. glared at
3.A. get B. want C. make D. cheer
4.A. exciting B. motivational C. sensitive D. surprising
5.A. sadly B. angrily C. disappointedly D. proudly
6.A. After B. Before C. Because D. For
7.A. ending B. completing C. beginning D. regarding
8.A. disappointed B. worried C. surprised D. delighted
9.A. if B. how C. why D. that
10.A. plan B. promise C. decision D. mind
11.A. attending B. joining C. entering D. holding
12.A. newspaper B. book C. report D. speech
13.A. deliver B. offer C. supply D. provide
14.A. help B. job C. god D. company
15.A. energy B. force C. power D. weight
16.A. searched B. wished C. expected D. accomplished
17.A. ready B. disappointed C. glad D. busy
18.A. examined B. searched C. defeated D. tested
19.A. help B. harm C. income D. money
20.A. selling B. speaking C. writing D. listening
高三英语完形填空中等难度题查看答案及解析
When I was twelve years old, my father took me to see Zig Zigler. I remember sitting in that dark hall listening to Mr. Zigler everyone’s spirits up to the ceiling, I there feeling like I could do anything. When we got to the car, I turned to my father and said, “Dad, I want to people feel like that.” My father asked me I meant. “I want to be a motivational speaker just like Mr. Zigler,” I replied. A（An） was born.
Recently, I began seeking my dream of motivating others. a four-year relationship with Fortune 100 Company as a sales-trainer and ending as a regional sales manager, I left the company at the height of my . Many people were that I would leave after earning a six-figure income. And they asked I would risk everything for a dream.
I made my to start my own company and leave my secure position after a regional sales meeting. The vice-president of our company delivered a that changed my life. He asked us, “If a god would offer you three wishes, what would they be?” After giving us a to write down the three wishes, he then asked us, “Why do you need a ?” I would never forget the power I felt at that moment. I realized that I had accomplished in the past had prepared me for this moment. I was ready and didn’t need a god’s help to become a motivational speaker. A motivational speaker was .
Having made that decision, I was immediately . One week after I gave notice, my husband was laid off from his job, and now we had no . But I held fast to my dream. The wonder really began to happen. In a short time my husband found a better job. And I was able to book several engagements with new customers. I discovered the incredible power of dreams.
1.A．rise B．blow C．put D．raise
2.A．left B．came C．arrived D．slipped
3.A．get B．hope C．make D．cheer
4.A．that B．what C．which D．if
5.A．dream B．idea C．girl D．speaker
6.A．After B．Before C．Because D．While
7.A．beginning B．working C．acting D．regarding
8.A．life B．love C．income D．career
9.A．disappointed B．moved C．surprised D．delighted
10.A．when B．why C．if D．how
11.A．plan B．promise C．decision D．mind
12.A．attending B．joining C．entering D．holding
13.A．newspaper B．book C．report D．speech
14.A．day B．second C．week D．moment
15.A．help B．job C．god D．company
16.A．everything B．anything C．nothing D．something
17.A．alive B．dead C．missing D．born
18.A．examined B．searched C．checked D．tested
19.A．help B．harm C．income D．money
20.A．selling B．speaking C．writing D．listening
高三英语完形填空中等难度题查看答案及解析
When my father died, one of the tasks that fell to me was to sort through and decide which objects to save and which to throw away. Now I look at the 51 of my life as if I were dead, 52 what my children will do with the human skull(骷髅) that 53 on the bookcase next to my desk. I couldn’t 54 them if they threw it out. They’ve been wanting to do that for some years, 55 will they know how much can be learned from 56 with a skull? And what about my books? 57 they can find some place in their 58 for ten thousand books. However, I know they will look at the white, plastic head of a horse on my desk and 59 it into a Glad trash bag without any 60 , never knowing that it is the only place 61 from the first chess set (棋子)I owned.
How many boxes of mine will my children 62 ? Can I trust my children with my 63 ? Every object of our lives is a 64 , and emotion swirls(旋动) around it like fog, hiding and 65 a tiny truth of the heart.
I look at these objects that are mine and know, too, that they are 66 of how alone I am, how alone each of us is, 67 no one knows what any object means except he or she who 68 it. I have the memory of taking it home 69 one of my newly-born children from the hospital; only I have the memory of what it looked like when I lived in that apartment and where it sat in that house. I look at the objects that are mine, and the memories are 70 and permeated（渗透着）with love. I look at the objects that are mine and know that I’m going to miss me very much.
A. tasks B. objects C. books D. pictures
【小题２】A. wondering B. designing C. concluding D. weaving
【小题３】A. cries B. sleeps C. sits D. smiles
【小题４】A. educate B. understand C. blame D. strike
【小题５】A. and B. so C. or D. but
【小题６】A. helping B. living C. playing D. speaking
【小题７】A. Honestly B. Luckily C. Naturally D. Surely
【小题８】A. desks B. bags C. apartments D. hearts
【小题９】A. drag B. take C. move D. throw
【小题1０】A. hesitation B. love C. care D. worry
【小题1１】A. casting B. expanding C. remaining D. shining
【小题1２】A. enjoy B. reserve C. find D. prepare
【小题1３】A. life B. passion C. respect D. heart
【小题1４】A. mark B. pleasure C. belief D. memory
【小题1５】A. preventing B. spreading C. protecting D. encouraging
【小题1６】A. symbols B. phenomena C. measures D. tracks
【小题1７】A. when B. once C. unless D. as
【小题1８】A. prefers B. repairs C. owns D. remembers
【小题1９】A. like B. for C. with D. to
【小题２０】A. strange B. warm C. new D. bitter
高三英语完型填空简单题查看答案及解析