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

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.
【C20】
选项 A、After all
B、In short
C、As usual
D、At least
答案B
解析 文章第二段提出了一个问题：“比特币到底是什么?”这是个设问句，作者用了几段文字来解释，而这是全文的最后一句话，起到总结的作用。B项In short表示“简而言之”，一般用在较长叙述之后，长话短说。
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