题干

“沉没成本” 是在经济学和商业决策制定过程中经常会用到的概念,代指已经付出且不可收回的成本,例如已经不可收回的时间、金钱、精力等。人们很容易因为对“沉没成本”过分眷恋而继续原来的错误,造成更大的亏损。对此,有经济学家建议要学会接受“沉没成本”,重新选择。下列行为符合这一建议的有(  )

①不法分子利用人们对“沉没成本”的不舍心态而不断进行电话和短信诈骗

②张小姐利用商家“反季销售”时机低价购买了好多漂亮衣服

③东北某市在企改中对部分资不抵债而又扭亏无望的企业进行破产清算

④丙投资者对被“套牢”的股票“割肉”抛售以防止更大损失

A:①②

B:①④

C:②③

D:③④

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D

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     "You see someone just sitting there, looking like they're stupid," explains teenager Manny Logan excitedly. "You just run up to them, slap(掌击) them and run off. It's funny."

    The 16-year-old Logan was describing "happy slapping". It's supposed to be fun but it's a new problem in Britain. Young people will attack passers-by while their friends record the whole thing on camera phones. It was first reported in south London six months ago. But, the practice has spread to other parts of the country and videos of attacks have become popular on the Internet.

    The young people are called "hoodies" because they usually wear a sweatshirt with a hooded top. The top can be used to cover the head or face.

    One study in England published earlier this year suggested that as many as one in four teenagers is an active offender. That includes both serious crimes and small acts like not paying for a bus ticket.

    The fear of youth crime has left some parts of towns empty of ordinary people.

    So, the British government declared war on public disorder last week. The Prime Minister has supported a decision by the country's biggest shopping centre in southeast of England to ban teenagers wearing hooded tops. The clothing helps troublemakers hide from the centre's cameras.

    This week, the government is going further. It plans to force teenage offenders to wear orange jackets while they do public service. The idea is to shame them in front of others.

    But some teenagers and experts have complained that, in their rush to stop the hoodies, politicians risk tarring all teenagers with the same brush.