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请仔细阅读短文并根据短文回答其后面的问题，从4个选项中选择1个最佳答案涂在答题卡相应的位置上。 Denny His nickname is Denny. He weighs 400 pounds; he is fearless and he never goes to sleep on the job. An ideal security guard? For many situations he may be. And if hes so good that you wish you had a dozen like him, just place your order. Denny is a robot guard. Denny can detect, within a 150-foot radius, the presence of anything or anybody that shouldnt be there. Its swiveling head contains microwave and infrared sensors that can detect people as well as smoke. In future editions the head will also contain sensors that can smell the weak smell of a human body. A high-resolution TV camera in Dennys head is on at all time. When something unexpected comes into view, the TV transmitter switches on. Thus the human overseer in the control center sees the sudden appearance of a picture on the monitor screen. At the same time the picture is automatically videotaped. Normal speed of the robot guards is about one mile an hour, and they can even talk: you have been detected, warns the voice from the clever guard. Denny is designed to patrol corridors and other areas after lock-down hours , not to move among people. If, say, a prisoner does get near the corridor where he should not be, itll immediately tell its base station by radio. | 
