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  3. Any sufficiently advanced technology, noted Arthur C. Clarke, a British science-fiction writer, is indistinguishable from magic.

Any sufficiently advanced technology, noted Arthur C. Clarke, a British science-fiction writer, is indistinguishable from magic.

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问题     Any sufficiently advanced technology, noted Arthur C. Clarke, a British science-fiction writer, is indistinguishable from magic. The fast-emerging technology of voice computing proves his【C1】________ Using it is just like casting a spell; say a few words into the air, and a nearby device can【C2】________your wish.
    The Amazon Echo, a voice-driven cylindrical computer that sits on a table top and answers to the name Alexa, can【C3】________music tracks and radio stations, tell jokes, answer questions and control smart【C4】________; even before Christmas it was already resident in about 4％ of American households. Voice assistants are【C5】________in smartphones, too; Apple’s Siri【C6】________over 2 billion commands a week, and 20％ of Google【C7】________on Android powered handsets in America are input by voice. Dictating e-mails and text messages now works【C8】________enough to be useful. Why type when you can talk?
    This is a huge shift. Simple【C9】________it may seem, voice has the power to transform computing, by providing a natural means of interaction. Windows, icons and menus, and then touchscreens, were welcomed as more【C10】________ways to deal with computers than entering complex keyboard【C11】________But being able to talk to computers【C12】________the need for the abstraction of a " user interface" at all.【C13】________mobile phones were more than existing phones without wires, and cars were more than carriages without horses, so computers without screens and keyboards have the【C14】________to be more useful and powerful than people can imagine today.
    Voice will not wholly【C15】________other forms of input and output. Sometimes it will remain more【C16】________to converse with a machine by typing rather than talking. But voice is destined to【C17】________a growing share of people’s interactions with the technology around them, from washing machines that tell you how much of the cycle they have left to virtual assistants in corporate call-centres.【C18】________,to reach its full potential, the technology requires【C19】________breakthroughs—and a resolution of the【C20】________questions it raises around the trade-off between convenience and privacy.
【C18】
选项 A、Therefore
B、However
C、Likewise
D、Though
答案B
解析 副词辨析题。A项Therefore因此；B项However然而；C项Likewise类似地；D项Tough尽管。上一句提到：“语音必将占越来越大的份额”，这是明显的肯定表述。该空下一句指出：“要充分发挥其潜能，语音技术还需要更多突破，而且必须解决由它引出的问题。”很明显，该句对语音的表述是否定的。故本空上下文是明显的“前肯后否”，即转折逻辑，故答案为B项。
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