Choose two quotations that express central ideas of the text. A “Bitcoins are a form of digital currency, a kind of money that exists only in computers online.” (paragraph 1)

B “Most money comes from banks after being issued by countries, such as U. S. dollars or Mexican pesos.” (paragraph 2)

C “Programmers from around the world—called miners—plug into the bitcoin network and complete these billions of calculations in about 10 minutes.” (paragraph 4)

D “But there’s another way: your parents could log on to a computer and transfer bitcoins directly to you in Paris in 10 minutes, for free.” (paragraph 7)

E “…bitcoin software is an important first step toward a digital currency that will revolutionize the way we think about and use money.” (paragraph 9)