All over the country these days, electronic mail messages are【B1】______with

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问题 All over the country these days, electronic mail messages are【B1】______with this odd little punctuation sequence :-(or one of its many variants :-). These are smileys, so-called because when you【B2】______your head to the left they look like little faces with a colon for eyes and a hyphen for a nose.
It was 20 years ago that Scott Fahlman taught the Net how to smile. He was a computer scientist who devoted his professional life to【B3】______intelligence, the practice of teaching computers how to think like humans. But the bearded scientist is perhaps best known for a flash of【B4】______that helped to【B5】______Internet culture.
By the early 1980’s, the Computer Science community was making heavy use of online bulletin boards or "BBS". A good many of the posts were【B6】______. The problem was that if someone made a sarcastic remark, a few readers would【B7】______to get the joke. This problem caused some people to suggest that maybe it would be a good idea to【B8】______mark posts that were not to be taken seriously. After all, when using text-based online communication,【B9】______. So on Sept. 19th, 1982, Fahlman typed :-) in an online message. "【B10】______," he later wrote. The "smiley face" has since become a staple of online communication.【B11】______ [br] 【B11】

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答案 This convention caught on quickly and soon spread by the primitive computer networks of the day

解析 This convention caught on fast and soon spread by the primitive computer network at that time

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