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Dear David,

I am Li Hua, a student from Xinhua Secondary School. ______________________________

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_____________________________________________________________________________

_____________________________________________________________________________

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Yours sincerely,

Li Hua

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However wealthy we may be, we can never find enough hours in the day to do everything we want. Economics deals with this problem through the concept of opportunity cost, which simply refers to whether someone¡¯s time or money could be better spent on something else.

Every hour of our time has a value. For every hour we work at one job we could quite easily be doing another, or be sleeping or watching a film. Each of these options has a different opportunity cost¡ªnamely, what they cost us in missed opportunities.

Say you intend to watch a football match but the tickets are expensive and it will take you a couple of hours to get to and from the stadium. Why not, you might reason, watch the game from home and use the leftover money and time to have dinner with friends? This¡ªthe alternative use of your cash and time¡ªis the opportunity cost.

For economists, every decision is made by knowledge of what one must forgo¡ªin terms of money and enjoyment¡ªin order to take it up. By knowing precisely what you are receiving and what you are missing out on, you ought to be able to make better-informed, more reasonable decisions. Consider that most famous economic rule of all: there¡¯s no such thing as a free lunch. Even if someone offers to take you out to lunch for free, the time you will spend in the restaurant still costs you something in terms of forgone opportunities.

Some people find the idea of opportunity cost extremely discouraging: imagine spending your entire life calculating whether your time would be better spent elsewhere doing something more profitable or enjoyable. Yet, in a sense it¡¯s human nature to do precisely that we assess the advantages and disadvantages of decisions all the time.

In the business world, a popular phrase is ¡°value for money.¡± People want their cash to go as far as possible. However, another is fast obtaining an advantage: ¡°value for time.¡± The biggest restriction on our resources is the number of hours we can devote to something, so we look to maximize the return we get on our investment of time. By reading this passage you are giving over a bit of your time which could be spent doing other activities, such as sleeping and eating. In return, however, this passage will help you to think like an economist, closely considering the opportunity cost of each of your decisions.

1.According to the passage, the concept of ¡°opportunity cost¡± is applied to ________.

A. weighing the choice of opportunities

B. reducing missed opportunities

C. making more money

D. taking more opportunities

2.The ¡°leftover ... time¡± in Paragraph 3 probably refers to the time ________.

A. taken to have dinner with friends

B. spared for watching the match at home

C. saved from not going to watch the match

D. spent on the way to and from the match

3.What are forgone opportunities?

A. Opportunities you make up for.

B. Opportunities you forget in decision-making.

C. Opportunities you give up for better ones.

D. Opportunities you miss accidentally.

4.What is the author¡¯s attitude towards the concept of ¡°opportunity cost¡±?

A. Indifferent B. Negative

C. Subjective D. Objective

B

Last year, A Bite of China, made by CCTVs Documentary Channel, sparked discussion not only on Chinese food, but also on locally made documentary programs.

With fascinating footage£¨Ó°Æ¬Æ¬¶Î£© and stories, documentaries encourage us to think about interesting issues we wouldn¡¯t necessarily know about.

So, what makes a good documentary, and what should we pay attention to when we watch one? Here, we offer a few easy strategies to help you get the most out of watching documentaries.

Pay attention to the themes

While watching a documentary, keep your eyes and ears peeled for the themes people talk about and what ideas they focus on. Is it meant to be informative or raise a certain emotional response?

Think critically

Listen to what the people in the documentary are saying and ask yourself the following questions If you were debating with someone or introducing a new concept, would you say the things the people in the documentary are saying? Do the arguments make sense?

Check the sources

If you¡¯re sitting at the computer and can¡¯t think of anything to do, why not look up the points the documentary made and see if they are accurate? You could even read more about what is presented in the documentary.

Who are the creators?

The creators or financial backers of a film will usually be involved with how the subject matter is presented. For instance, as the documentary 2016 Obama¡¯s America was directed in large part by a conservative writer, it¡¯s not surprising that it¡¯s critical of President Obama from the beginning.

1.Which of the following is the most proper to describe documentaries?

A. non-fictional B. controversial

C. subjective D. thoughtful

2.The passage is mainly written to ______.

A. inform us of factors of good documentaries.

B. help us enjoy documentaries better.

C. introduce ways of making documentaries.

D. help us figure out themes of documentaries.

3.Why is 2016 Obama¡¯s America mentioned in the article?

A. Because the author dislikes Obama.

B. Because it is directed by a writer.

C. Because it is quite popular in China.

D. Because it is a persuasive example.

4.According to the passage, ______.

A. it is always difficult to get the themes of documentaries.

B. financial backers often appear in documentaries.

C. it¡¯s better to think twice about what is in documentaries.

D. many points of documentaries are not accurate.

When my friend put out the idea of homeschooling to her parents, the first reaction they gave was, ¡°You are cutting the child off the world.¡± Did the child really get cut off or did the child socialize better?

The moment we hear of homeschooling, we think the child will have no opportunities to interact with peers. However, in my friend¡¯s opinion, we forget that when attending a regular school, the child is not into socializing all the while. The child is confined to so many other activities. Studies take a major role in a child¡¯s life. The child hardly has the time to interact at school.

The child might be meeting and studying along with many peers; however, how many kids interact with all the kids in a class? But in homeschooling system, as my friend mentioned, the kid has all the time and can plan his day accordingly. During the day the child studies just like other school-going kids but with no burden of homework and project work, the child has so much free time in the evening as to effectively interact and play with peers. The quality time the child spends in education is really impressive.

Homeschooled kids have the opportunity to socialize more often as they have a lot of time in their hands. They can also make socializing a regular habit. Just as my friend said, her child goes to a neighboring park almost every day and has a set of friends who go there daily. Other children get back home to finish off homework and project work whereas her child who is already through with studies gets the opportunity to spend time with family members.

When I heard this, I really felt how lucky the child was. Definitely the child had a better opportunity to socialize when compares with my kids. However, I might not consider homeschooling for my kid, as I am so used to the traditional schooling system and feel regular schooling the safest bet.

1.What is the author¡¯s attitude towards his friend¡¯s idea of homeschooling?

A. Surprised. B. Interested.

C. Negative. D. Confident.

2.The author¡¯s purpose in writing the passage is to _________.

A. explain what homeschooling is.

B. express his views on homeschooling.

C. share his ways of teaching his children.

D. promote homeschooling

3.The underlined word ¡°confined¡± in the Para.2 can be replaced by _______.

A. free B. restricted

C. devoted D. accustomed

4.According to the author what is the biggest advantage of homeschooling children?

A. They can be better at socializing.

B. They can be more popular.

C. They will become braver.

D. They can study better.

5.How does the passage mainly develop?

A. By following the order of importance.

B. By following the order of time

C. By presenting facts.

D. By making comparison.

Even in a weak job market, the old college try isn¡¯t the answer for everyone. A briefing paper from the Brookings Institution warns that ¡°we may have overdone the message¡± on college, senior fellow Isabel Sawhill said.

¡°We¡¯ve been telling students and their families for years that college is the only way to succeed in the economy and of course there¡¯s a lot of truth to that,¡± Ms. Sawhill said. ¡°On average it does pay off¡­ But if you load up on a whole lot of student debt and then you don¡¯t graduate, that is a very bad situation.¡±

One comment that people often repeat among the years of slow job growth has been the value of education for landing a job and advancing in a career. April¡¯s national unemployment rate stood at 7.5%, according to the Labor Department. The unemployment rate for high-school graduates over 25 years old who hadn¡¯t attended college was 7.4%, compared with 3.9% for those with a bachelor¡¯s degree or more education. The difference is even bigger among those aged 16-24. The jobless rate for those with only a high school diploma in that age group is about 20%. At the same time, recent research by Canadian economists warns that a college degree is no guarantee of promising employment.

Ms. Sawhill pointed out that among the aspects that affect the value of a college education is the field of one¡¯s major: students in engineering or other sciences end up earning more than those who major in the arts or education. The cost of tuition and the availability of financial aid are other considerations, with public institutions generally a better financial bargain than private ones.

She suggested two ways of improving the situation: increasing vocational-technical(Ö°Òµ¼¼ÄÜ) training programs and taking a page from Europe¡¯s focus on early education rather than post-secondary learning. ¡°The European countries put a little more attention to getting people prepared in the primary grades,¡± she said. ¡°Then they have a higher requirement for whoever goes to college¡ªbut once you get into college, you¡¯re more likely to be highly subsidized(×ÊÖú).¡±

She also is a supporter of technical training¡ªto teach students how to be workers, such as plumbers, welders and computer programmers¡ªbecause ¡°employers are desperate¡± for workers with these skills.

1.People usually think that _____.

A. the cost of technical schooling is a problem

B. one will not succeed without a college degree

C. technical skills are most important for landing a job

D. there is an increased competition in getting into a college

2.What does the underlined part ¡°taking a page from¡± mean?

A. hearing from.

B. changing from.

C. differing from.

D. learning from.

3.What can we infer from the passage?

A. Public institutions charge more for education.

B. European universities are stricter with students.

C. Students with certain skills are in great demand.

D. Canadian students prefer to major in engineering.

4.Which would be the best title for the text?

A. Is the ¡®Go to College¡¯ message overdone?

B. The new requirement of Labor Market

C. Primary education in European countries

D. Is technical training more popular?

Electric cars are dirty. In fact, not only are they dirty, but they might even be more dirty than their gasoline-powered cousins.

People in California love to talk about ¡°zero-emissions (ÅÅ·Å) vehicles¡±, but people in California seem to be clueless about where electricity comes from. Power plants mostly use fire to make it. Apart from the few people who have their roofs covered with solar cells, we get our electricity from generators (·¢µç»ú). Generators are fueled by something----usually coal, oil, but also by heat generated in nuclear power plants. There are a few wind farms and geothermal (µØÈÈ) plants as well, but by far we get electricity mainly by burning something.

In other words, those ¡°zero-emissions¡± cars are likely coal-burning cars. Because the coal is burned somewhere else, it looks clean. It is not true. It's as if the California Greens are covering their eyes----¡°If I can't see it, it's not happening.¡± Gasoline is an incredibly (¼«Æä) efficient way to power a vehicle; a gallon of gas has a lot of energy in it. But when you take that gas (or another fuel) and first use it to make electricity, you waste a nice part of that energy, mostly in the form of wasted heat--at the generator, through the transmission lines, etc.

A gallon of gas may drive your car 25 miles. But the electricity you get from that gallon of gas won't get you nearly as far---so electric cars burn more fuel than gasoline-powered ones. If our electricity came mostly from wind or geothermal, or solar, then an electric car truly would be clean. But for political, technical, and economic reasons, we don't use much of those energy sources.

In addition, electric cars' batteries which are poisonous for a long time will eventually end up in a landfill (À¬»øÌîÂñ³¡). And finally, when cars are the polluters, the pollution is spread across all the roads. When it's a power plant, though, all the junk is in one place. Nature is very good at cleaning up when things are not too concentrated, but it takes a lot longer when all the garbage is in one spot.

1.Which of the following words can replace ¡°be clueless about¡± in Paragraph 2?

A. be familiar with. B. fail to understand.

C. be curious about. D. show their interest in.

2.The electricity we get from a gallon of gas may make our car run _________.

A. at least 25 miles B. more than 25 miles

C. less than 25 miles D. as far as 25 miles

3.In the author¡¯s opinion, compared with cars using gas, electric cars are more __________.

A. harmful B. expensive

C. efficient D. environmentally-friendly

4.It can be inferred from the passage that __________.

A. electric cars¡¯ batteries are no longer poisonous in the landfill

B. electric cars are not clean since we get electricity mainly by burning something

C. zero-emissions vehicles should be chosen to protect our environment

D. now electric cars are used more than their gasoline-powered cousins

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