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.

用显微镜观察的材料必须是（　　）

阅读下文，回答相关问题

晋太原中，武陵人捕鱼为业．缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷．渔人甚异之．复前行，欲穷其林。
林尽水源，便得一山。山有小口，仿佛若有光。便舍船，从口入．初极狭，才通人．复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田美池桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人．黄发垂髫，并怡然自乐。
见渔人，乃大惊，问所从来．具答之。便要还家，设酒杀鸡作食．村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出洒食。停数日，辞去，此中人语云：“不足为外人道也！”
既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。
南阳刘子骥，高尚士也。闻之，欣然规往。未果，寻病终。后遂无问津者。