The price of a bitcoin topped $900 last week, an enormous surge in value that arrived amidst Congressional hearings where top U.

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问题     The price of a bitcoin topped $900 last week, an enormous surge in value that arrived amidst Congressional hearings where top U.S. financial regulators took a surprisingly optimistic view of digital currency. Just 10 months ago, a bitcoin only sold for $13.
    The【C1】________increase was big news across the【C2】________ , from Washington to Tokyo to China, and it left many asking themselves: "What on earth is a bitcoin?" It’s a good question.
    Bitcoin is a digital currency, meaning it’s money controlled and stored entirely by computers【C3】________ across the internet, and this money is finding its way to more and more people and businesses around the world.【C4】________it’s much more than that, and many people—【C5】________the sharpest of internet【C6】________as well as seasoned economists—are still【C7】________to come to terms【C8】________its many identities.
    Bitcoin isn’t just a currency, like dollars or euros or yen. It’s a way of making【C9】________. like PayPal or the Visa credit card network. It lets you hold money, but it also lets you spend it and【C10】________it and move it from place to place, almost as cheaply and easily as you’d send an email.
    As the press so often points out, bitcoin lets you do all this without【C11】________your identity. But at the same time, it’s a system that operates【C12】________in the public view. All bitcoin【C13】________are recorded online for anyone to see, lending a certain transparency to the system, a transparency that can drive a new【C14】________in the economy.
    Bitcoin is much more than a money service. It’s a re-imagining of【C15】________finance, something that【C16】________ barriers between countries and frees currency from the control of federal governments. Bitcoin is controlled by open source software that operates according to the【C17】________of mathematics—and by the people who collectively supervise this software. The software【C18】________ on thousands of machines around the world, but it can be changed It’s just that a majority of those supervising the software must【C19】________to the change.【C20】________, bitcoin is kind of like the internet, but for money.
【C17】

选项 A、laws
B、rules
C、regulations
D、acts

答案A

解析 本句提到比特币由开源软件(open source software)控制,而该软件的运营是根据数学(mathematics)的________。选项都有“法同,法规”的意思。A项law是普通用词,泛指由最高当局所制订、立法机构所通过的任何成文或不成文的法规或条例,还可以表示“规律、定律”,在这里laws of mathematics表示“数学定律”。B项rules通常指机关、团体的规章、条例或比赛规则;也指对人行为、方法等所作的规定。还可指习俗所承认的规定。C项regulations指用于管理、指导或控制某系统或组织的规则、规定或原则等。D项acts指经立法机构通过并由行政管理签署的法案。这三项都不能体现比特币和数学的关联。
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