【正确答案】 A

【答案解析】[听力原文]
Robots can help disabled people to lead more independent and comfortable lives. For example, Japanese inventors are developing a robot that can replace a guide dog for the blind. Named Meldog, it "sees" obstacles using sonar; the same technique is used to navigate and hunt: emitting very high-pitched sounds and discerning shapes from the echoes. Meldog is programmed with a detailed map of its owner"s surroundings, and it identifies landmarks by recognizing the walls and signposts it "sees".
Meldog moves on wheels, and, as it can sense how fast its owner walks, is always able to remain a short distance ahead. It communicates with its owner by means of a radio linked to a special belt that the owner wears. The belt emits a code in the form of mild electric pulses felt through electrodes placed on the skin. The blind person must learn which series of pulses is an instruction to stop, for example, or to turn right or left.
In the United States, a robotic workstation helps quadriplegics to work as computer operators. It responds to voice commands and can perform such tasks as page-turning, diskhandling, and making a cup of coffee. One such robot even brings its owner a paper tissue when he says "Ah choo!".
Robots have been used in American hospitals to perform such tasks as shaving patients and brushing their teeth. At a hospital in Connecticut, a robot delivers meals from the kitchen to patients" rooms, finding its way along corridors and even negotiating the elevators on its own. Nicknamed "Roscoe", it has a complete map of the hospital stored in its computer memory. Should Roscoe happen upon an object that does not fit the map, such as a wheelchair along a corridor, it either amends its course to avoid collision, or waits until the object has passed.
Robots will never replace human help, but they can free nurses and therapists to carry out tasks requiring greater judgment and compassion.