火车长100m，从车头离桥头200m处由静止开始以0.5m/s²的加速度做匀加速直线运动，桥长为150m．求：

创新是引领科技发展的第一动力，******强调：“科技是国家强盛之基，创新是民族进步之魂”。阅读材料，回答问题。

材料一：作为中部地区的区域中心城市，武汉的经济发展了，可水环境却承受着极大的压力。为此，2015年1月，武汉市政府印发了《武汉市中心城区排涝、治污、供水两年决战行动计划》，计划用2至3年实践，实施149个项目，投资140亿元，全力推进雨污水管网混错接改造和社区、高校、企事业单位内部雨污分流改造工作。为贯彻落实这一决策，武汉市各级政府、广大干部群众积极行动起来，一个全社会参与美丽江城建设的良好氛围正在逐步形成。

材料二：因为利用了最新的科技成果，转车方便、快捷、支付简单。加上惬意推广的补贴，优惠的价格吸引不少市民选择专车服务。目前，出租车行业主要依赖于政府限制运营数量，实施保护价格的措施来进行运营和管理。专车服务与出租车行业产生了强烈的利益冲突，因此在许多国家的扩张都受到了激烈反对。政府出于经济稳定和就业保障的目的，保护出租车行业的做法受到社会质疑，这种做法会损害消费者权益，容易滋生腐败现象。

材料三：由于转车“跑得太快”，法规“跟不上”，结果就出现了一个灰色地带，使政府对交通客运行业的管理变得困难。但转车服务的新模式，又能满足市场上高品质、多样化和差异化的出行需求。对此现状，中国交通运输部认为，不能对专车“一棍子打死”，要按照以人为本、鼓励创新、趋利避害、规范管理的原则进行管理。

皮拉大沙丘（下图）位于大西洋畔的法国西南部波尔多市(0°34'E．44°50'N)．这里夏季炎热干燥，冬天温和多雨，它的东边是都郁葱葱的森林。皮拉沙丘以每年5米的速度持续向内陆推进。该地景观反映了自然地理环境的（    ）

    The world's most human-like robot has begun work as a university receptionist. And scientists positively predict the new technology will 1 provide childcare and offer 2 to lonely elderly people.

    With her soft skin and flowing dark-brown hair, Nadine does not only meet and greet3, smile, make eye contact and 4 hands, but she can even5 past guests and get into conversation based on 6 chats.

    Unlike 7 robots, Nadine has her own personality and 8 . She can be happy or sad, 9 on the topic.

    Powered by intelligent 10 similar to Apple's Siri or Microsoft's Cortana, she is the creation of scientists at the Nanyang Technological University in Singapore and is based on her creator Prof Nadia Thalmann.

    Prof Thalmann, the director of the Institute for Media Innovation who led the development said robots such as Nadine are bound to become more visible in offices and 11 in future.

    “Robotics technologies have 12 significantly over the past few decades and are already being used in manufacturing and logistics,” she said.

    “As countries worldwide face 13 of an aging population, 14 robots can be one solution to 15 the shrinking(缩小的) workforce, become personal 16 for children and the elderly at home, and 17 serve as a platform for healthcare services in future.”

    “Over the past four years, our team at NTU have been 18 cross-disciplinary(跨学科的) research in social robotics technologies— involving engineering, computer science, linguistics, psychology and other19 — to transform a virtual human(虚拟的人), from within a computer, into a 20 being that is able to observe and interact with other humans.”