Online Degrees
Today, you can earn a degree from a major university without ever having sat in one of their classrooms. Many colleges and universities are offering online courses and degree programs now.
Online Learning Programs
With a computer and an Internet connection, you can earn a degree from home, work, or anywhere else for that matter. Online degree programs follow much the same routines as traditional learning, with a few twists. There are lectures, but they won't be in person. There are assignments (作業(yè)) , but you won't hand them to your instructor. In most situations, you are free to "go to class" when it fits your"schedule. If you get a phone call during class, you don't have to miss anything. If you get sick, you don't have to ask for someone's notes, and you just visit the lecture later.
You'll communicate with your instructor by e-mail, chat room and instant messaging. Your  classroom will live in a special software program. Contrary to popular belief, you will have close  contact with other students and the instructor.
Evaluating the Program
There are a lot of questions to ask before you make your selection, such as:
How do students interact with each other?
★Online programs can use chat rooms, instant messaging, teleconferencing, and video conferencing to communicate. The key is to find a program that has this interaction built into it and even requires it.
★What kind of reputation does the school have?
It may seem simple-a good school will have a good online program. This reputation,however, may not be as straightforward as you think. It's not uncommon for a great school to have a weak program or two. So you'd better look at the overall quality of the school and make a judgment.
The Employers' View
As more and more employees get online degrees and use them in the workforce(職場) ,  hiring managers will begin to feel more secure about the quality of education these people have.
小題1:In which way is online education special?
A．If you get sick, you'll miss the lecture.
B．There are lectures, but you don't need to meet the lecturers.
C．If you get a phone call during class, you will miss something.
D．There are assignments, and you must hand them to your instructor.
小題2:What is the most important part of online communication?
A．To use e-mails.
B．To look for a program with interaction.
C．To use chat rooms and instant messaging.
D．To use teleconferencing and video conferencing.
小題3:For whom is the passage probably written?
A．College students.B．Hiring managers.
C．Adult students.D．High school students.

小題1:B
小題2:B
小題3:C

試題分析：文章介紹了現(xiàn)在流行的網(wǎng)上的學(xué)習(xí)課程，為了讓很多成年人不要上大學(xué)就可以得到大學(xué)的學(xué)位，很多大學(xué)都設(shè)置網(wǎng)上課程。和傳統(tǒng)的課程相比，網(wǎng)上課程更靈活，自由，互動更強。
小題1:細(xì)節(jié)題：從第二段的句子：There are lectures, but they won't be in person. 可知網(wǎng)上的課程，但是你不要親自參加講座，選B
小題2:細(xì)節(jié)題：從倒數(shù)第三段的句子：The key is to find a program that has this interaction built into it and even requires it.可知網(wǎng)上交流的重要部分是找一個可以互動的課程，選B。
小題3:推理題：從文章最后一段的句子：As more and more employees get online degrees and use them in the workforce(職場) , 可知這篇文章是為成年的學(xué)生寫的。選C。
練習(xí)冊系列答案
相關(guān)習(xí)題

科目：高中英語 來源：不詳 題型：完形填空

閱讀下面短文，并根據(jù)短文內(nèi)容完成下列各題。
Should the color be white or black? Or perhaps navy blue! Well, choosing the right graduation dress for middle school students can be a little difficult at times. Here are some ideas for graduation dress for middle school students.
For many students, middle school graduation marks a big change in their lives. This is a step that takes students away from junior high school but towards the elementary level before senior high school. Compared to elementary (初級的) school, middle school means more lessons and more classes, but of course, students can also see it as an opportunity to make new friends.
Well, it is no wonder that the graduation day of a middle school is often planned formally. Although this occasion is not considered to be really formal like a high school graduation, it is still celebrated in many ways. Besides, it is also considered to be a very important part of someone's life.
Many schools often have middle school graduation parties. Well, the question that often arises in the minds of young students is about the right graduation dress for themselves. Long flowing dress with caps are commonly seen. Students should always stick to a common graduation dress that creates uniformity (統(tǒng)一) among all. The dress can be royal blue, black or even golden. If they seem too formal for the party, you can even plan for a common color for all the students. For example, white shirts with black pants or skirts can serve the needs of such a special occasion.
Whether the graduation party is simple or great, the graduation dress for middle school students should be planned accordingly. The main idea would be to accept the success of the students and celebrate with family and friends.
小題1:What does the text mainly talk about? (no more than 10 words)
_____________________________________________________________
小題2:What does middle school mean to students compared to elementary school? (no more than l2 words)
_____________________________________________________________
小題3:Please explain the underlined word “arises’’ in Paragraph 4 in English. (no more than 3 words)
_____________________________________________________________
小題4:What is the common graduation dress like? (no more than 9 words)
_____________________________________________________________
小題5:What is the purpose of a graduation party? (no more than l5 words)
_____________________________________________________________

查看答案和解析>>

科目：高中英語 來源：不詳 題型：閱讀理解

We probably all know people, either at work or in our personal lives, who are really good listeners. No matter what kind of situation we’re in, they always seem to know just what to say and how to say it so that we’re not offended(被冒犯) or upset. We probably also know people who are masters at managing their emotions(情緒). They don’t get angry in stressful situations. Instead, they have the ability to calmly look at a problem and find a solution. They take criticism(批評) well, and they know when to use it to improve their performance.
People like these who have a high degree of emotional intelligence, or EI(情商). They know themselves very well, and they’re also able to sense the emotional needs of others.
As more and more people accept that emotional intelligence is just as important to professional success as technical(專業(yè)的) ability, companies are increasingly using EI when they hire and promote(提拔) someone. For example, one large cosmetics (化妝品) company recently changed their hiring process for salespeople to choose candidates(被選的人) based on emotional intelligence. The result? Salespeople hired with the new system have sold, on average, $91,000 more than salespeople selected under the old system.
Emotional intelligence is the ability to recognize your emotions, understand what they are telling you, and realize how your emotions affect people around you. Emotional intelligence also involves your perception (洞察力) of others: when you understand how they feel, this allows you to manage relationships more effectively.
People with high emotional intelligence are usually successful in most things they do. Why? Because they are the ones that others want on their team. When people with high EI send an email, it get answered. When they need help, they get it. Because they make others feel good, they go through life much more easily than people who are easily angered or upset.
The good news is that emotional intelligence can be taught and developed. Many books and tests are available to help you determine your current EI, and identify where you may need to do some work.
小題1:According to the passage, we’re all probably impressed by people who _____.
A．a(chǎn)re ready to help others
B．a(chǎn)re very successful in their lives
C．have high emotional intelligence
D．know how to control their temper
小題2:By mentioning the cosmetics company, the author tries to _____.
A．stress the importance of emotional intelligence
B．speak highly of its new salespeople
C．show its effective hiring system
D．explain what improvements it has made
小題3:The underlined word “they” in the fourth paragraph refers to “_____”.
A．your emotions B．people around you
C．effective relationshipsD．your opinions of others
小題4:Which statement is TRUE about people with high EI?
A．They are usually good speakers.
B．They are born to be sensitive and intelligent.
C．They don’t get angry in any situation.
D．They can understand others’ feelings well.
小題5:What’s most likely to be discussed in the paragraph that follows?
A．What emotional intelligence is.
B．How emotional intelligence can be improved.
C．Many books on emotional intelligence.
D．More people with high emotional intelligence.

查看答案和解析>>

科目：高中英語 來源：不詳 題型：閱讀理解

[1] As adolescents(青少年), having a meaningful effect on the world can seem like an impossible task for the simple fact of being kids.  Changing the world does not only mean finding a cure for cancer, eliminating poverty, or finding the origin of humanity, but recycling a piece of paper as well. Going Green is a practical way that adolescents can have a real, meaningful influence in the world.  There are numerous options of how individuals can change their lifestyles to be more eco-conscious(有生態(tài)環(huán)保意識的). What follows are three simple ways young adolescents can go green and change the world.
1. Recycle
[2] According to a Wire & Twine online article, 63 million newspapers come out every day and of those 44 million are thrown away; recycling the Sunday newspaper alone we could save half a million trees a week.
[3] The age of technology constantly creates new phones, iPods, or new computers.  Many will stand in line for hours if not days to get their hands on the new piece of technology, but what happens with the old ones once they are replaced?  Nothing, according to Earth911 about 75% of the old devices sit in the back of a drawer collecting dust.  By taking them to the local stores that collect them, they go to poor people which in turn removes them from landfills(垃圾填埋場) where the phones explode because of the lead and lithium-ion(鋰離子) the phones contain.
2. Go vegetarian one day a week
[4] Instead of breaking down the pros and cons(利弊) of the vegetarian lifestyle into a long boring paragraph, here are some astonishing facts on going vegetarian for only one day.  According to Noam Mohr, a physicist at the New York University, the United States would save 100 billion gallons of water which is enough to supply all homes in New England for about 4 months.
[5] The United States would save 70 million gallons of gas which is enough to fuel all the cars of Canada and Mexico combined and still have some to spare. The United States could prevent 3 million tons of soil erosion(侵蝕), 4.5 million tons of animal wastes, and about 7 tons of ammonia emissions (氨排放). The Environmental Defense concludes with the most interesting fact: if the entire population gives up one meal of chicken, the amount of carbon dioxide accumulated would be the same amount if more than half a million cars were taken off U.S. roads.
3. 第6題
[6] Most drink bottled water because of the common view that bottled water is healthier than regular tap water; actually, 25% of bottled water comes from regular tap water and all that is done extra is it going through a filter(過濾器).  Tap water has higher regulations from the FDA (Food and Drug Administration美國食品藥品管理局) than bottled water does.  Companies do not need to list where they got the water from, how they purify the water, or what chemicals their plastic water bottles contain.  Plastic bottles do not get recycled 90% of the time which results in 1.5 million tons of plastic in landfills which take thousands of years to rot.  Not only are you drinking the same water as that in your house but also paying extra.  The average 24-pack of bottled water cost $3.97 at the local Wal-Mart and a reusable water bottle cost between $4.99-$7.99; just imagine how much money could be saved if reusable water bottles replaced plastic water bottles.
[7] Changing the world for a positive has to start somewhere and while it may be hard and at times it may seem as if the small changes that are being done are not affecting the world, keep in mind what Margaret Mead once said, “Never doubt that a small group of thoughtful citizens can change the world; indeed, it’s the only thing that ever has.”
小題1:What’s the whole passage mainly talked about?
A．Ways to protect environment.B．Ways to become powerful.
C．The importance of recycling.D．The importance of saving water.
小題2:What’s the meaning of the underlined sentence in Paragraph 1?
A．Changing the world involves many questions.
B．It’s not easy to change the world.
C．Changing the world is not so difficult.
D．We can actually do everything.
小題3:How much of the daily newspapers are thrown away according to Paragraph 2?
A．About 44%.B．About 63%.C．About 70%.D．About 75%.
小題4: In the article, the writer _____ to tell us the benefits of the vegetarian lifestyle.
A．does a lot of reasoningB．uses many facts
C．borrows VIPs’ phrasesD．puts forward new ideas
小題5:What’s the benefits of giving up just one day of eating meat according to Paragraph 4 and 5?
A．Much water and gas would be saved.B．Much land would be spared.
C．More animals would survive.D．More cars would be on the roads.
小題6:Which of the following can be the subtitle(小標(biāo)題) of Paragraph 6?
A．Drink healthy waterB．Produce bottled water
C．Give up bottled waterD．Reuse tap water
小題7:Why do many people choose to drink bottled water according to Paragraph 6?
A．They think it’s cheaper.
B．They think it’s healthier.
C．They think it’s more fashionable.
D．They think it’s environmental friendly.
小題8:What’s the main idea of the last paragraph?
A．We should find a proper time to start action
B．Small changes will make big differences.
C．Personal efforts will not affect the world.
D．A small group of people matters.

查看答案和解析>>

科目：高中英語 來源：不詳 題型：閱讀理解

  In my last essay, I wrote briefly about a bathtub in the classroom. What really was the use of that bathtub? “Guys, it is Reading Workshop time now. When I call your table, get your things, please!” said Mrs. Toalson. She was holding a cup that had many sticks in it; on every stick was written each student’s name and table number.
What does she mean? Probably books, I thought. Mrs. Toalson picked a stick out of the cup and said, “Okay, Aniqa’s table; Table Two, you may get your things. ”Then my four classmates ran for the cushions（墊子）in the bathtub. Mrs. Toalson kept picking sticks and calling out different table numbers. On hearing their numbers, students would run to get cushions. Because there were not enough cushions for everyone, the last to be called had to go without. Those students sighed, “Oh! They are the lucky ones.”
Finally, Mrs. Toalson picked the last stick ; what is she going to do now?
“Kate, you may use the bathtub. ” Mrs. Toalson said. Gosh! Use the bathtub? Is Kate going to take a bath, I wondered. Kate is the girl who had pretty brown hair. She ran happily with her book to the bathtub and lay down in it. As she read, she hugged a teddy bear. I think it must be comfortable reading in a bathtub.
Except for lucky Kate, everybody had to read elsewhere. Some were sitting on the seats, some were lying down under the table, and everybody’s reading pose（姿勢）was different.
Just then, my friend found me sitting at my table quietly, not doing anything. She said, “Mary, let me find you a book. ” I nodded. Then she led me to a comer of the classroom where the book-shelf was and picked a picture book for me.
Regina thought that it would be more fun to read outside on the grass. What a great idea! The next day our whole class went to the park across the street from our school. As we read, animals such as squirrels ran around us. It was amazing !
小題1: In Mrs. Toalson’s Reading Workshop, every student can learn _________.
A．brieflyB．comfortablyC．quicklyD．eagerly
小題2: Which of the following is TRUE according to this passage?
A．Mrs. Toalson told the student to sit in the bathtub as a punishment.
B．The student who used the bathtub in that class was thought to be unlucky.
C．Not every student can get a cushion in Mrs. Toalson’s Reading Workshop.
D．In Mrs. Toalson’s Reading Workshop, only the best student can lie down reading.
小題3: Who got the chance to use the bathtub in that class?
A．A student whose table was last called.
B．The student who sat at the table quietly.
C．The student who got the last cushion.
D．A student whose table was first called.
小題4: The purpose of the passage is to ________.
A．tell us how to use a bathtub in the classroom
B．introduce us a new way of teaching style
C．teach us how to organize reading activifies in class
D．show us the importance of reading poses

查看答案和解析>>

科目：高中英語 來源：不詳 題型：閱讀理解

A regular drop in the sun’s radiation(輻射) can cause unusually cold winters in parts of North America and Europe, scientists say, a finding that could improve long-range forecasts and help countries prepare for snowstorms.
Scientists have known for a long time that the sun has an 11-year cycle during which radiation measured by sunspots on the surface reaches a peak then falls. But explaining a clear connection to weather is harder.
“Our research confirms the observed connection between solar change and regional winter climate,” lead author Sarah Ineson of the UK Met Office told the reporters in an email. The study was published in the magazine Nature Geoscience on Monday.
The researchers found that the reducing of ultraviolet(UV，紫外線) radiation from the sun can affect high-altitude wind patterns in the Northern Hemisphere(半球), causing cold winters.
“While UV levels won’t tell us what the day-to-day weather will do, they show us the bright future of improved forecasts for winter conditions for months and even years ahead. These forecasts play an important role in long-term possibility planning,” Ineson, a climate scientist, said.
Ineson and colleagues from Imperial College London and the University of Oxford used satellite data that more accurately(精確的) measures UV radiation from the sun and found a much greater change than previously thought.
They found that in years of low activity, unusually cold air forms high in the atmosphere over the tropics. This causes a redistribution(重新分配) of heat in the atmosphere, making easterly winds that bring freezing weather and snowstorms to northern Europe and the United States and milder weather to Canada and the Mediterranean.
When solar UV radiation is stronger, the opposite occurs.
More study was needed, though. A key uncertainty in the experiment lay in the satellite data used, because it covers only a few years. “So questions remain concerning both accuracy(精確) and also applicability to other solar cycles,” she said.
小題1:The new finding claims cold winters in the North Hemisphere can be caused by ______.
A．a(chǎn) sharp rise in the amount of sunspots
B．a(chǎn) drop in the sun’s UV radiation
C．a(chǎn) complex computer model simulation
D．a(chǎn) clear link between the sun and the earth
小題2: It has long been known by scientists that ______.
A．UV radiation can affect high-altitude wind patterns
B．there’s a clear connection between the sun’s activity and weather
C．the sun’s radiation reaches a peak every eleven years
D．they can predict day-to-day weather conditions from UV levels
小題3:What will happen if the sun turns into years of high activity according to the finding?
A．Canada and the Mediterranean will have milder weather.
B．The whole Northern Hemisphere will suffer from extreme winter days.
C．Freezing cold weather will appear in northern Europe.
D．Burning hot weather will appear in the United States.
小題4: It can be inferred from the passage that ______.
A．researchers have analyzed the data collected in eleven years
B．long-term weather conditions can be accurately predicted depending on UV levels
C．the research doesn’t seem correct and true enough due to limited satellite data used
D．climate scientists have just begun their research in severe weather forecast

查看答案和解析>>

科目：高中英語 來源：不詳 題型：閱讀理解

One reaction to all the concern about tropical deforestation（毀林） is a blank stare that asks the question, "Since I don't live there, what does it have to do with me?"
The answer is that your way of life, wherever you live in the world, is tied to the tropics in many ways. If you live in a house, wash your hair, eat fruits and vegetables, drink soda, or drive a car, you can be certain that you are affected by the loss of tropical forests.
Biologically, we are losing the richest regions on earth when, each minute, a piece of tropical forest, the size of ten city blocks, disappears. As many as five million species of plants, animals, and insects (40 to 50 percent of all living things) live there, and are being lost faster than they can be found and described. Their loss is immeasurable.
Take rubber for example. For many uses, only natural rubber from trees will do. Synthetics are not good enough. Today over half the world's commercial rubber is produced in Malaysia and Indonesia, while the Amazon's rubber industry produces much of the world's four million tons. And rubber is an important material in making gloves, balloons, footwear and many sporting goods. Thousands of other tropical plants are valuable for their industrial use.
Many scientists strongly believe that deforestation contributes to the greenhouse effect -- or heating of the earth from increased carbon dioxide in the atmosphere. As we destroy forests, we lose their ability to change carbon dioxide into oxygen.
Carbon dioxide levels could double within the next half-century, warming the earth by as much as 4.5 degrees. The result? A partial melt-down of polar ice caps, raising sea levels as much as 24 feet; even 15 feet could threaten anyone living within 35 miles of the coast. Unbelievable? Maybe. But scientists warn that by the time we realise the severe effects of tropical deforestation, it will be 20 years too late.
Can tropical deforestation affect our everyday lives? Now, you should have got the answer.
小題1:The underlined word "synthetics" probably means_________.
A．natural rubberB．tropical materials
C．man-made materialD．commercial rubber
小題2:According to the passage, which of the following is NOT true?
A．The forests are losing their function in turning carbon dioxide into oxygen.
B．Many of our daily uses are related to the tropical forests.
C．Tropical plants can be used to make industrial products.
D．High carbon dioxide levels will make the earth warmer.
小題3:The author's attitude towards the tropical deforestation is _________ .
A．puzzlingB．coldC．supportingD．opposed
小題4:Which of the following might be the best title for the passage?
A．Tropical ForestsB．The Value of Tropical Forests
C．Tropical Forests and Our LifeD．The Greenhouse Effects

查看答案和解析>>

科目：高中英語 來源：不詳 題型：閱讀理解

For medical students, real experience begins not in a classroom but at a teaching hospital. These doctors in training are guided. But sometimes accidents happen and the students get injured.
For example, they might stick themselves with a needle while treating patients. Such needle sticks are common. But a recent study found that medical students often fail to report them. Failing to report an injury like this can be dangerous if a patient, or a medical worker, has an infectious disease.
Researchers at Johns Hopkins University in Baltimore, Maryland, did the study, which involved a survey answered by almost 700 surgeons in training in the United States.
Almost 60% said they had suffered needle stick injuries when they were in medical school. Many said they were stuck more than once. Yet nearly half of those whose most recent incident happened in school did not report it to a health office. If they had, they would have been tested to see if they needed treatment to prevent an infection like HIV or hepatitis.
Most known cases of HIV or hepatitis are reported, but other possible infections often are not. Martin Makary, the lead author of the study, says medical students who are stuck put themselves and others in danger from infectious diseases.
Doctor Makary said, "A needle that goes through the skin needs to be as sharp as possible.” Doctors in training may have to do hundreds of stitches (縫線) in some cases to close the skin after an operation.
Doctor Makary said, “I support using blunt tip needles which are considered safer. This needle is still sharp enough to go through body tissue, but it does have a blunt tip, so that if it accidentally goes into my finger, it's much less likely to hurt me."
How common are needle sticks among health care workers? An estimated 600,000 to 800,000 of these and similar injuries are reported each year in the United States. But Doctor Makary says the real number may be much higher.
The study advises doctors to protect their hands by wearing two sets of gloves. It also urges hospitals to establish a special telephone number for medical workers and students to call if they are injured. The idea is for hospitals to send a clear message that there is no reason not to report this kind of accident.
小題1:It is dangerous for medical students not to report needle stick injuries because _________.
A．they don’t know how to treat themselves.
B．they may meet more needle sticks
C．it may cause some diseases
D．it may make patients sad.
小題2:If they report needle stick injuries, medical students will __________.
A．receive treatmentB．be forbidden to use sharp needles
C．spend more time on trainingD．receive tests
小題3:The underlined word “blunt” in Paragraph 7 is the closest in meaning to “__________”.
A．not sharpB．not safeC．not longD．not thick
小題4:What do we know from the passage?
A．Doctors who don’t report needle stick injuries will be punished.
B．Needle sticks among health care workers will reduce sharply in the future.
C．Most needle stick injuries happen in the United States.
D．Two suggestions are given to protect medical workers and students.
小題5:Where can this passage most probably be found?
A．In an entertainment magazineB．In a science magazine
C．In a storybookD．In science fiction

查看答案和解析>>

科目：高中英語 來源：不詳 題型：完形填空

Kids have their own ideas about money---some are sensible and others are not so wise.
Twelve-year-old Amanda thinks it’s        to save and not blow your money right away  “ so you can         other things”.
When it comes to credit cards, eight-year-old Jeremie says when the monthly        comes in “ you sign it and then you give it back” ---leaving out the part about actually        it.
These kids are        far away from the working world, but the ideas they’re forming about        could affect how much they save, how they use credit cards and how much debt they finally take on in later life.
High school business teacher Jeff Balch said his students had        knowledge about money other than spending. “ They don’t know most things because        talks to them about them---as in their parents,” said Balch, “The discussions tend to be in terms of kids        too much money, but no one tells them why, where their money goes.
Mitch Murphy said students’ message to the task force was to “ make it       ”. “ It may be difficult to have a 14-or 15-year-old student get too        about retirement planning, ” Murphy said, “ But if you want to talk about a cellphone contract or a debt card,they will be engaged in.” Murphy said learning financial literacy (能力)　    ,  well        getting into the work force, should stay with Canadians for life and        the country as a result.
Sandra Martin said children can start learning about money when they learn to       . “ Sit down with the flyers and look at how much things cost,” Martin said. Babysitting and birthday money could be        and there would be a(n)        as to how much could be debited(借) every month, she said.
“ The reality is that we’re not spending with cash anymore. If you’re always in         of your child’s money, then they’re never going to learn what it means to save for something that’s      .”
Balch said he tries to make his students realize the differences between needs, wants and priorities(優(yōu)先權(quán)). If they haven’t learned self-control and if they haven’t learned how to        money, they can easily spiral(螺旋上升) out of control.
小題1:
A．goodB．difficultC．easyD．hard
小題2:
A．sellB．exchangeC．buyD．involve
小題3:
A．materialB．billC．catalogueD．figure
小題4:
A．payingB．replacingC．recyclingD．a(chǎn)dopting
小題5:
A．a(chǎn)lreadyB．stillC．evenD．a(chǎn)lmost
小題6:
A．beliefB．partC．disciplineD．money
小題7:
A．muchB．moreC．littleD．many
小題8:
A．everybodyB．somebodyC．a(chǎn)nybodyD．nobody
小題9:
A．spendingB．costingC．takingD．sparing
小題10:
A．a(chǎn)mazingB．realC．a(chǎn)ctiveD．legal
小題11:
A．disappointedB．skepticalC．enthusiasticD．fortunate
小題12:
A．correctlyB．earlyC．lateD．patiently
小題13:
A．beforeB．a(chǎn)fterC．whenD．while
小題14:
A．benefitB．botherC．contactD．educate
小題15:
A．cookB．tradeC．countD．paint
小題16:
A．stoodB．bannedC．displayedD．deposited
小題17:
A．a(chǎn)ttitudeB．conclusionC．limitD．data
小題18:
A．searchB．controlC．needD．place
小題19:
A．importantB．formalC．scientificD．independent
小題20:
A．borrowB．lendC．increaseD．handle

查看答案和解析>>

同步練習(xí)冊答案