2. 外语
  3. For most dog owners, the expression "work like a dog" doesn’t make much sense. While the typical canine companion certainly give

For most dog owners, the expression "work like a dog" doesn’t make much sense. While the typical canine companion certainly give

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问题     For most dog owners, the expression "work like a dog" doesn’t make much sense. While the typical canine companion certainly gives his owner immeasurable happiness, it’s obvious that he lives a life of remarkable leisure. Our pets gracefully go from the carefree days of childhood directly to the rest and relaxation of retirement, skipping the working part of life entirely.
    But some dogs happily perform very demanding jobs for much of their life, putting in a full day’s work just like the rest of us.【R1】______Every day, they help their masters get from place to place more safely.
    Guide dogs help blind or visually impaired people get around in the world.【R2】______A guide dog must know to disobey any command that would put the handler in danger. 【R3】______
    This capacity is extremely important at crosswalks, where the handler and dog must work very closely together to navigate the situation safely.【R4】______Dogs cannot distinguish the color of traffic lights, so the handler must make the decision of when it is safe to proceed across the road. The handler listens to the flow of traffic to figure out when the light has changed and then gives the command "Forward".【R5】______If there are cars approaching, the dog waits until the danger is gone and then follows the forward command.
    Guide dogs enjoy their work immensely, and they get a lot of satisfaction from a job well done, but there is no room for typical dog fun during the workday. Game, treats and praise distract the dog from helping its handler navigate the course.【R6】______This is because a guide dog must be able to come to the handler’s workplace or be in public places without creating a disturbance.
    When you see a guide dog on the job, it is extremely important that you recognize that it is at work.【R7】______People are very impressed with guide dogs and so we have a natural inclination to praise them, but the best thing you can do to help a guide dog is to leave it alone so that it can pay attention to its surroundings and maintain its focus on its handler. 【R8】______
    A. In most countries, they are allowed anywhere that the public is allowed, so they can help their handlers be any place they might want to go.
    B. When the team reaches the curb, the dog stops, signaling to the handler that they have reached a crosswalk.
    C. This ability, called selective disobedience, is perhaps the most amazing thing about guide dogs — that they can balance obedience with their own assessment of the situation.
    D. If there is no danger, the dog proceeds across the road in a straight line.
    E. Guide dogs, one of the most familiar sorts of working dogs, provide an invaluable service to humans.
    F. Guiding is very complicated, and it requires a dog’s undivided attention.
    G Petting or talking to the dog breaks its concentration, which impairs the handler’s ability to get around in his or her surroundings.
    H. Even when the handler doesn’t need assistance, a guide dog on the job is trained to ignore distractions and keep still.
【R2】
选项
答案A
解析 文章第3段的第1句介绍了导盲犬的主要作用，即帮助视力受损的人四处活动。句A提到了在大多数国家，导盲犬被允许进入所有的公共场所，因此它们可以帮助主人去他们想去的任何地方。这是对第1句话的解释说明，因此答案为A。
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