What I learned from my bitter experience is () you should never underestimate the ability of your enemy.

I can’t (  ) how to do this.

Passage 1 The digital currency is a form of currency that is used only in digital or electronic form, and not in physical form.It is also called digital money, electronic money or electronic currency.Digital currencies are intangible and can only be owned and transacted by using computers or electronic wallets connected to the Internet.While physical currencies, like banknotes and coins, are tangible and transactions are possible only by their holders who have their physical ownership.Like any standard currency, digital currencies can be used to buy goods as well as to pay for services.The People's Bank of China(PBOC)is aiming to make banknotes and coins electronic and internationalized(国际化).“For the internationalization of RMB,we have said many times that it's a natural process and our goal is not to replace the US dollar or any other international currency,”Li Bo,deputy governor(副行长)of the PBOC said.“I think our goal is to allow the market to choose and to improve international trade.” China's digital yuan is popular with most of the people in China.Now the PBOC is taking some steps to make it play an increasingly important role, especially in all kinds of trades at home and abroad.The digital currency isn't ().

Passage 1 The digital currency is a form of currency that is used only in digital or electronic form, and not in physical form.It is also called digital money, electronic money or electronic currency.Digital currencies are intangible and can only be owned and transacted by using computers or electronic wallets connected to the Internet.While physical currencies, like banknotes and coins, are tangible and transactions are possible only by their holders who have their physical ownership.Like any standard currency, digital currencies can be used to buy goods as well as to pay for services.The People's Bank of China(PBOC)is aiming to make banknotes and coins electronic and internationalized(国际化).“For the internationalization of RMB,we have said many times that it's a natural process and our goal is not to replace the US dollar or any other international currency,”Li Bo,deputy governor(副行长)of the PBOC said.“I think our goal is to allow the market to choose and to improve international trade.” China's digital yuan is popular with most of the people in China.Now the PBOC is taking some steps to make it play an increasingly important role, especially in all kinds of trades at home and abroad.What's the meaning of the underlined word"intangible"?

Passage 1 The digital currency is a form of currency that is used only in digital or electronic form, and not in physical form.It is also called digital money, electronic money or electronic currency.Digital currencies are intangible and can only be owned and transacted by using computers or electronic wallets connected to the Internet.While physical currencies, like banknotes and coins, are tangible and transactions are possible only by their holders who have their physical ownership.Like any standard currency, digital currencies can be used to buy goods as well as to pay for services.The People's Bank of China(PBOC)is aiming to make banknotes and coins electronic and internationalized(国际化).“For the internationalization of RMB,we have said many times that it's a natural process and our goal is not to replace the US dollar or any other international currency,”Li Bo,deputy governor(副行长)of the PBOC said.“I think our goal is to allow the market to choose and to improve international trade.” China's digital yuan is popular with most of the people in China.Now the PBOC is taking some steps to make it play an increasingly important role, especially in all kinds of trades at home and abroad.What is the goal of the PBOC on currency reform (改革)?

Passage 1 The digital currency is a form of currency that is used only in digital or electronic form, and not in physical form.It is also called digital money, electronic money or electronic currency.Digital currencies are intangible and can only be owned and transacted by using computers or electronic wallets connected to the Internet.While physical currencies, like banknotes and coins, are tangible and transactions are possible only by their holders who have their physical ownership.Like any standard currency, digital currencies can be used to buy goods as well as to pay for services.The People's Bank of China(PBOC)is aiming to make banknotes and coins electronic and internationalized(国际化).“For the internationalization of RMB,we have said many times that it's a natural process and our goal is not to replace the US dollar or any other international currency,”Li Bo,deputy governor(副行长)of the PBOC said.“I think our goal is to allow the market to choose and to improve international trade.” China's digital yuan is popular with most of the people in China.Now the PBOC is taking some steps to make it play an increasingly important role, especially in all kinds of trades at home and abroad.What’s the best title of the passage?

Passage 2 It would be difficult to have a society like ours without public goods such as defense (国防), transportation (交通), and other services.A public good is one that a person can use without reducing the use of it for another person.One of the best examples of a public good is national defense.One person can benefit from our national defense without reducing another person’s benefits.In fact, it is difficult to keep any person in our society from enjoying the benefits of national defense.The market system does not work well in producing public goods.This is because a person who refuses to pay for a public good cannot be kept from using it.Suppose that the neighbors in a high crime (犯罪) area decide to hire a police force.Each neighbor, except Mrs.Smith, agrees to pay for it.Mrs.Smith refuses to pay because she knows that if all the others pay for the service, the police will still guard the area.So Mrs.Smith can enjoy the benefits without paying anything.The market system has no way to deal with this type of problem.For this reason, we cannot ask each person to make a direct payment in the form of product price.Therefore, we collect money for public goods by using taxes.The writer gives the example of national defense in paragraph 2 in order to show that ().

Passage 2 It would be difficult to have a society like ours without public goods such as defense (国防), transportation (交通), and other services.A public good is one that a person can use without reducing the use of it for another person.One of the best examples of a public good is national defense.One person can benefit from our national defense without reducing another person’s benefits.In fact, it is difficult to keep any person in our society from enjoying the benefits of national defense.The market system does not work well in producing public goods.This is because a person who refuses to pay for a public good cannot be kept from using it.Suppose that the neighbors in a high crime (犯罪) area decide to hire a police force.Each neighbor, except Mrs.Smith, agrees to pay for it.Mrs.Smith refuses to pay because she knows that if all the others pay for the service, the police will still guard the area.So Mrs.Smith can enjoy the benefits without paying anything.The market system has no way to deal with this type of problem.For this reason, we cannot ask each person to make a direct payment in the form of product price.Therefore, we collect money for public goods by using taxes.The person who does not pay for a public good ().

Passage 2 It would be difficult to have a society like ours without public goods such as defense (国防), transportation (交通), and other services.A public good is one that a person can use without reducing the use of it for another person.One of the best examples of a public good is national defense.One person can benefit from our national defense without reducing another person’s benefits.In fact, it is difficult to keep any person in our society from enjoying the benefits of national defense.The market system does not work well in producing public goods.This is because a person who refuses to pay for a public good cannot be kept from using it.Suppose that the neighbors in a high crime (犯罪) area decide to hire a police force.Each neighbor, except Mrs.Smith, agrees to pay for it.Mrs.Smith refuses to pay because she knows that if all the others pay for the service, the police will still guard the area.So Mrs.Smith can enjoy the benefits without paying anything.The market system has no way to deal with this type of problem.For this reason, we cannot ask each person to make a direct payment in the form of product price.Therefore, we collect money for public goods by using taxes.From the passage we learn that the purpose of collecting taxes is to ().

Passage 3 One day I said that I would go abroad for further studies after my college education.My decision evoked(引起)the objection of my family:Why should I borrow a huge sum of money for overseas studies while I might receive the same education at home at a relatively low cost? My answer is:In addition to knowledge,I can gain experience that those who stay at home will never have.First,experience is the opportunity for the real-life use of foreign languages.There is no better opportunity to improve second-language skills than living in the country in which it is spoken.Second,living and studying abroad offers me a different perspective on the world.On a university campus, foreign students are likely to meet their counterparts(对应的人或物)from different countries and areas and be exposed to different ideas and values.This helps to have a better understanding of different societies and inevitably sees my own country in a new light.Third, overseas experience may be frustrating and painful, but it is helpful at the same time.A person going abroad for study often experiences much more difficulties.Yet, the difficulty, with the frustration(沮丧)brought on by culture shock, is a rewarding experience for one's future life.Although going abroad is expensive and perhaps painful, the payoff is worthwhile.For the benefit is not merely knowledge gained, but the experience desirable in one's personal life.Why does the author want to go abroad for further studies?