be using by now simply never appeared.
D.Hightech things are not always convenient to
people's life.
答案:B 由第二段中的“Many of these predictions didn't consider how people would like to use the technology.”可知,预言者必须考虑人们的实际需求,故B项表述错误。
48.Robot Helpers haven't been used in most people's
home because ________.
A.using the kind of robots at home is simply a waste
of time and money
B.the kind of robots hasn't been developed yet
C.people find it difficult to control the kind of robots
D.the kind of robots won't bring people practical use
答案:D 由第五段中的“And probably the idea of robots cooking our dinners and washing our clothes is just too strange.”可知,机器人保姆没有实现是因为这个想法不切合实际,故D项为正确答案。
49.The underlined expression “caught on” probably
means ________.
A.become popular
B.understood
C.been wonderful
D.been perfect
答案:A 根据该句上文的介绍,过去一家美国公司预言:2000年大部分家庭使用可视电话;下文解释了这个预言没能实现,或者说没有普及的原因,由此可知,catch on的意思为“变得流行或普及”。
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