A．The need to explore inner space.

　　B．How to explore inner space.

　　C．The difficulty in exploring inner space.

　　D．What “computationally closed” means.

　　B

　　TOKYO — If you grow old in Japan, you may expect to be served food by a robot, ride a voice­recognition wheelchair or even possibly hire a nurse in a robotic suit — all examples of cutting­edge technology to care for the country's rapidly graying population.

　　With nearly 22 percent of Japan's population already aged 65 or older, businesses here have been rolling out everything from easy­entry cars to remote­controlled beds, fueling a care­technology market worth some $1.08 billion in 2006, according to industry figures.

　　At a home care and rehabilitation (恢复) convention in Tokyo this week, buyers crowded round a demonstration of Secom Co.'s My Spoon feeding robot，which helps elderly or disabled people eat with a spoon and a fitted swiveling (转动的) arm.

　　Operating a joystick (操纵杆) with his chin, developer Shigehisa Kobayashi maneuvered the arm toward a block of soft tofu, deftly (灵巧地) getting the fork to break off a piece. The arm then returned to a preprogrammed position in front of the mouth, allowing Kobayashi to bite and swallow.

　　“It's all about empowering people to help themselves，” Kobayashi said. The Tokyo­based company has already sold 300 of the robots, which come with a price tag of $ 3,500. “We want to give the elderly control over their own lives，” he said.

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