【正确答案】 A、B、D

【答案解析】The problem created by retirement, such as reemployment, is inevitably a great detriment to the current society, as it challenges the whole society with a more complicated old-age insurance and old-age security system, and it also poses great pressure to the government. However, the fact is that almost no enterprise is willing to give job opportunities to aging retired workers. One obvious reason is that the retired workers once devoted their life to the out-of-date industry which cannot survive in nowadays' modern world since it is known to all that the recent prevailing industry is environmental-friendly and high-tech ones. In addition, it is hard to train the retired workers as they have long got used to their former job and tend to be unacceptable and unproductive towards the present job. Last but not the least, there comes a time in every worker's life when he bounds to drop off because of increasing age, his judgment may be as good as ever and his intelligent be unimpaired, but his physical powers do diminish, therefore, it is difficult for him to adapt to changing situations. In order to solve this complicated problem, here an appeal for retired workers to start their own small business is recommended.