关于家庭电路和安全用电，下列说法正确的是（   ）

中国新首富、阿里巴巴执行主席马云说：“我年轻时候曾经想，梦幻般的生活就是早上在香港吃早餐，中午在巴黎喝咖啡，晚上在纽约和人共进晚餐……”马云梦想的实现离不开发达的交通。两次工业革命中，在交通领域内都有重大发明的国家是（　　）

不改变73的大小，把73改写成两位小数是____，把0.4300化简是____．

    In 1986, the Honda automotive company wanted to see if it could make a human-like robot, to help in home, play football, balance on one foot, and even dance. Over the years there were some problems but soon the researchers managed to get a robot named ASIMO. It could walk on uneven(不平坦的) surfaces, and move its center of gravity like we do to climb stairs.

    More recently, ASIMO was improved so it could turn round and run at six kilometers per hour, using its upper body to control movement.

    ASIMO is designed to be friendly. It is hoped that robots like this could be used to help elderly people in their home. Honda are also using this technology to help people with disabilities. It can also push a cart(手推车) and open and close doors. ASIMO can even shake hands. It stands 120 centimeters tall, so that it can look into adult faces when they are sitting down. It can hold two kilos in its hands. It can even carry a tray without dropping the contents.

    So, where next for this kind of robot? Well, while ASIMO is attractive, it is still controlled by a human. Researchers in the USA are working on the robots that can learn about the world around them, and give a reply to human touch and voice. The robots are even learning to recognize(辨认) objects, people and vocabulary. Soon the descendants(后代) of these robots may be serving you drinks or helping with jobs at home and at work.