正确答案: E
题目:关于纵隔 ( )
学习资料的答案和解析:
根据以下内容,回答下面的题目。Insure means to protect _51_ a loss of money.Most people can budget their money so that their income will cover expected expenses _52_ food, clothing, housing, and public services.But, there is no way to know _53_ who will suffer a crisis (危机) such as a serious illness, fire, flood, or a car accident.Such crises usually _54_ great expense.Even if people could predict crises, it would be hard to save enough money to _55_ the expenses.Insurance is a system _56_ a company collects money from many individuals and then pays certain expenses whenever one of those insured individuals is faced with a certain crisis.An insurance policy _57_ how much the insurance costs and how much the company will pay when a policy holder is faced with a certain crisis.There are many different kinds of insurance, _58_ hospital, motor-car and fire.Insurance can be rather expensive but most people buy insurance of some kinD.Insurance is something _59_ people buy and hope they will _60_ need._________
阅读下面的现代文,完成下面的题目:随着计算机和网络技术的发展,特别是加密技术的进步,开始出现了电子现金这一新的货币形式。电子现金是一种通过电子方式进行银行署名的数字信息。 它和信用卡不一样,信用卡本身并不是货币,而是一种转账手段,电子辊金本身就是一种货币,可以直接用来购物。但它又和金币、纸币不一样,黾没有物理实体的货币,需要通过数据的交换实现现金的功能。 电子现金是一种数字信息,它和纸币一样,本身没有价值所以有被伪连的危险。为此要使用电子签名等加密技术。从技术上说,电子签名比纸币 上使用的水印更难伪造。但电子现金和其他数字信息一样容易复制。因此,需要防止电子 现金持有者将其复制。然后向多家店铺支付。另外,电子现金的匿名性会给来路不明的钱财提供辩洗钱的方便,这点需要防范。 电子现金蕴藏着创造巨大的数字商品市场的可能性,所谓烫字商品就是在交易中不用真的商品在场,只把有关商品的信息列出供选购,到提货时二一取出真正的商品。在数字商品市场中,靠电子现金和数字商品间的信息交换完成交易无论生产地和消费地相距多远,都可以一样进行交易,交易所花的费用几乎为零,所以今后一样将得到巨大的发展。对“电子现金”的解说,正确的一项是( )