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)

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)

It is a and e

Explanation:

the president was the speaker and it was a great part of history.

explanation:

video of the national aeronautic space administration's (nasa) coverage of president john f. kennedy’s address at rice university, houston, texas, concerning the nation's efforts in space exploration. in his speech the president discusses the necessity for the united states to become an international leader in space exploration and famously states, "we choose to go to the moon in this decade and do the other things, not because they are easy, but because they are hard."

it is an infinitive phrase with a subject.