题目

阅读短文，从每题所给的A、B、C和D四个选项中，选出最佳选项。     Almost every second of every day an older adult falls in the United States. That's approximately 29 million falls per year and nearly 27, 000 deaths, according to the Centers for Disease Control and Prevention.     Still in the stating stage, the Active Pelvis Orthosis (APO) system in Switzerland wants to make a lightweight, wearable exoskeleton (外骨骼) that could detect signs of balance loss and assist with balance recovery to keep the elderly wearer from falling, only when needed.     Other exoskeletons, either in development or on the market today, assist with movement and make heavy objects feel lighter. Mobility-impaired people can walk again. But none of these devices predict what the wearer is going to do next and take measures to correct an unsteady move.     The 3 kilogram (6.7 pound) exoskeleton was built entirely from scratch by the research team and is designed to be worn on the lower half of the body. A waistband connects to two movable carbon fiber braces (支架), each one positioned on the outer side of a leg. Tiny motors and so-called "adaptive oscillators" (适配振荡器) in the computer circuits use a special process to detect the, wearer's unique paces. That part takes just a few minutes.     While wearing the exoskeleton, a person may feel the braces and the motors pushing slightly on their legs. If their paces go against normal, the motors create a force in the braces that cause them to stiffen up and push a little more strongly against the legs, which provides stability.     In the next three years, the APO hopes to develop something that is commercially available. （1） Why is the new exoskeleton invented? A . To slower users' walking paces. B . To improve users' walking ability C . To promote users' sense of balance. D . To prevent users from falling （2） What's the feature of the new exoskeleton? A . It keeps users warm. B . It is worn on the back. C . It helps users move around. D . It corrects an unsteady move. （3） What does paragraph 4 mainly talk about? A . How the new exoskeleton works. B . Where the braces are positioned. C . How long it takes to detect the user's paces. D . What the new exoskeleton was built from. （4） What is the purpose of the author in writing this text? A . To call on care for the elderly. B . To introduce a new invention. C . To advertise new device. D . To bring hope for the elderly. 答案： D D A B

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