3. Passage Thirty-OneAdam Smith was the first person to see the importance of the division of labor.He gave us an example of the process by which pins were made in England.“One man draws out the wire， another strengthens it， a third cuts it， a fourth points it， and a fifth gives it a head.Just to make the head requires two or three different operations.The work of making pins is divided into about eighteen different operations， which in some factories are all performed by different people， though in others the same man will sometimes perform two or three of them.”Ten men， Smith said， in this way， turned out twelve pounds of pins a day or about 4，800 pins a worker.But if all of them had worked separately and independently without division of labor， they certainly could not have made twenty pins in a day and not even one.There can be no doubt that division of labor is an efficient way of organizing work.Fewer people can make more pins.Adam Smith saw this， but he also took it for granted that division of labor is itself responsible for economic growth and development and it accounts for the difference between expanding economies and those that stand still.But division of labor adds nothing new， it only enables people to produce more of what they already have.Adam Smith mentioned the number 4，800 in order to ().

43.What John said just now had little to do with the question ()discussion.

A. 　on

B. 　at

C. 　in

D. 　under

1.The Words of his old teacher left a ()impression on his mind.He is still influenced by them.

A. 　long

B. 　lively

C. 　lasting

D. 　liberal

9、Prices determine how resources are to be used.They are also the means by which products and services that are in limited supply are rationed(定量配给)among buyers.The price system of the United States is a complex network composed of the prices of all the products bought and sold in the economy as well as those of a variety of services， including labor， professional， transportation， and public services.The interrelationships(相互关系)of all these prices make up the “system” of prices.The price of any particular product or service is linked to a broad， complicated system of prices in which everything seems to depend more or less upon everything else.

45.In general， you cannot avoid making mistakes when you learn a new language.

32.Great changes have taken place in my hometown since the 1980s.Still ()changes will take place in the future.

A. 　greater

B. 　great

C. 　more great

D. 　greatest

4. Passage FourteenFor a long time， people have disagreed about whether golf is a sport or a game.On one side of the argument， people say that golf meets the dictionary definition of a sport， because it is a physical， athletic activity.They add that golf is recognized as a sport by sporting goods companies， athletic groups， fans， and the media.Also， golf’s inclusion in the Olympics in 2016 is more proof that it is a sport.On the other side， people say that golf is a game， not a sport.They say golf is not a very physical activity and can be played well by people who are overweight or injured.Also， golf was only recently added to the Olympics.For more than 100 years it was not included in the Olympic Games.For many， the Olympic Games serve as a measurement for whether an activity should be called a sport.Golf was first included in the Olympics in 1900.However， it was removed shortly thereafter because of a lack of participation and conflict with other golf events.Through the years， there were several attempts to bring golf back to the Olympics.It wasn’t until the 2016 Summer Olympics in Rio de Janeiro， Brazil that golf returned.Some say the return of golf does not prove that it is a sport.Rather， it only proves that the Olympics wanted to benefit from the star power of famous golfers like Tiger Woods.The disagreement continues today.Those who think golf is a sport point to pro-golfers like Woods， who are strong and fit.Those who disagree point to golfers like John Daly.He is a successful pro-golfer who once had health problems.So is golf a sport? The answer depends on who you ask——and whether that person owns a set of golf clubs.According to Paragraph 5， the inclusion of golf in the Olympics ().

1. Passage Twenty-NineHow can we get rid of garbage (垃圾)? Do we have enough energy sources to meet our future energy needs? These are two important questions that many people are asking today.Some people think that man might be able to solve both problems at the same time.They suggest using garbage as an energy source， and at the same time it can save the land to hold garbage.For a long time， people buried garbage or dumped (倾倒)it on empty land.Now， empty land is scarce.But more and more garbage is produced each year.However， garbage can be a good fuel to use.The things in garbage do not look like coal， petroleum， or natural gas; but they are chemically similar to these fossil fuels.As we use up our fossil-fuel supplies， we might be able to use garbage as an energy source.Burning garbage is not a new idea.Some cities in Europe and the United States have been burning garbage for years.The heat that is produced by burning garbage is used to boil water.The steam that is produced is used to make electricity or to heat nearby buildings.In Paris， France， some power plants burn almost 2 million metric tons of the city’s garbage each year.The amount of energy produced is about the same as would be produced by burning almost a half million barrels of oil.Our fossil fuel supplies are limited.Burning garbage might be one kind of energy source that we can use to help meet our energy needs.This method could also reduce the amount of garbage piling up on the earth.What two problems can man solve by burning garbage?

40.Theory is based on practice and ()serves practice.

A. 　in turn

B. 　in tone

C. 　in return

D. 　in practice

5. Passage Thirty-TwoHave you ever heard of a pawpaw (木瓜)? If not， do not feel bad.Many Americans do not know of the fruit， although it is native to the U.S.Once， however， it was one of the most popular fruits in North America.Happily， those who love the pawpaw are trying to return it to its former position in American foods.A pawpaw is a tropical fruit that used to be grown along the East Coast from New York to Florida and all over the eastern U.S.At one time， it could be found as far west as Nebraska.The pawpaw was an important food for Native Americans and even early European settlers.Pawpaws reportedly were a favorite treat of George Washington， the first U.S.president， who especially liked them cold.Thomas Jefferson， the third U.S.president， was also a fan of the fruit.He planted pawpaws at his home in Virginia.He also sent pawpaw seeds to his friends in France.American explorers Lewis and Clark wrote in their journals about the pawpaw.The pawpaw is difficult to be sold commercially.The fruit requires a very special environment—low， wet areas that sometimes flood.It has a very short harvest season， from two to three weeks in September and October.In addition， the fruit is good to eat for only two to three days after harvesting.This makes it hard to sell anywhere distant from the pawpaw tree it comes from.Planters are again growing pawpaw trees and harvesting the fruit.In several states farmers have organized “pawpaw festivals” to reintroduce people to food.At such a festival in Maryland recently， farmers displayed different products made with pawpaws， like pawpaw jams， pies， ice-cream and beer.Pawpaw festivals are organized in some states ().

3. Passage Twenty-NineHow can we get rid of garbage (垃圾)? Do we have enough energy sources to meet our future energy needs? These are two important questions that many people are asking today.Some people think that man might be able to solve both problems at the same time.They suggest using garbage as an energy source， and at the same time it can save the land to hold garbage.For a long time， people buried garbage or dumped (倾倒)it on empty land.Now， empty land is scarce.But more and more garbage is produced each year.However， garbage can be a good fuel to use.The things in garbage do not look like coal， petroleum， or natural gas; but they are chemically similar to these fossil fuels.As we use up our fossil-fuel supplies， we might be able to use garbage as an energy source.Burning garbage is not a new idea.Some cities in Europe and the United States have been burning garbage for years.The heat that is produced by burning garbage is used to boil water.The steam that is produced is used to make electricity or to heat nearby buildings.In Paris， France， some power plants burn almost 2 million metric tons of the city’s garbage each year.The amount of energy produced is about the same as would be produced by burning almost a half million barrels of oil.Our fossil fuel supplies are limited.Burning garbage might be one kind of energy source that we can use to help meet our energy needs.This method could also reduce the amount of garbage piling up on the earth.According to the passage， which of the following is NOT true?