D．The demand also contributes to the new robot revolution.

　　解析：选D。段落大意题。根据D。

　　解析：选B。文章结构题。第一段引入话题；第二段介绍了机器人的发展趋势；第三、四段分别从科技的角度和消费者的需求和购买力的角度分析了机器人变革的幕后因素；最后一段则侧重于作者的预测。B

　　According to a new US study，couples who expect their children to look after them in old age should hope they have daughters because daughters are twice as attentive as sons overall.

　　The research by Angelina Grigoryeva，from Princeton University，found that，while women provide as much care for their elderly parents as they can manage，men do as little as they can get away with and often leave it to female family members.

　　Her analysis of the family networks of 26，000 old Americans concluded that gender(性别) is one of the most important things that decide whether or not people will actively care for their elderly parents.sented at the annual conference of the American Sociological Association in San Francisco，she concludes that simply having a sister makes men likely provide less care.

　　Using data from the University of Michigan Health and Retirement Study，a study which has been tracking a cross－section of over－50s for the last decade－giving efforts when they have a sister－giving responsibilities to their sisters.”ibilities，a figure which has risen by a tenth in a decade.

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