[填空题]IBM researchers are attempting to warm up human-computer relationships. For example, IBM, International Business Machines, has been working on getting computers to recognize human{{U}} (36) {{/U}}, such as an arm wave to move a{{U}} (37) {{/U}}object on screen. Recently, the company’ s researchers have gone a{{U}} (38) {{/U}}further by training a computer to recognize human{{U}} (39) {{/U}}To demonstrate their progress, IBM{{U}} (40) {{/U}}out Pong, a{{U}} (41) {{/U}}head without body that can react to human facial expressions with a smile or a{{U}} (42) {{/U}}Pong uses a camera to{{U}} (43) {{/U}}your gestures in pain or anger or frowning and uses software to interpret what it sees. But don’t expect your computer to start grinning at you any time soon.{{U}} (44) {{/U}}In the meantime, you can get a taste of the future by playing with basic gesture-recognition technology on your own Windows PC.{{U}} (45) {{/U}}Cybernet’s $40 Headhunter software can track and t