单选题
Since the early 1930s, Swiss banks had prided themselves on their system of banking secrecy and numbered accounts Over the years, they had successfully【C1】______every challenge to this system by their own government who,【C2】______, had been frequently urged by foreign governments to reveal information about the financial affairs of certain account【C3】______The result of this policy of secrecy was【C4】______a kind of mystique had grown up around Swiss banking. There was a widely-held belief that Switzerland was【C5】______to wealthy foreigners, mainly because of its numbered accounts and bankers' reluctance to ask awkward questions【C6】______depositors.【C7】______to the mystique was the view that if this secrecy was ever given up, foreigners would fall over themselves in the rush to【C8】______money, and the Swiss banking system would virtually collapse overnight. To many,【C9】______, it came like a bolt out of the【C10】______, when, in 1977, the Swiss banks announced they had signed a【C11】______with the Swiss National Bank(the Central Bank). The aim of the agreement was【C12】______the improper use of the country's bank secrecy laws, and its【C13】______was to curb severely the system of secrecy. The rules which the banks had agreed to observe【C14】______the opening of numbered accounts subject to much closer【C15】______than before. The banks would be required, if necessary, to【C16】______the origin of foreign funds going into numbered and other accounts. The idea was to stop such accounts being used for【C17】______purposes. Also, they agreed not to accept funds resulting from tax【C18】______or from crime. The pact represented essentially a tightening up of banking rules.【C19】______the banks agreed to end relations with clients whose identities were unclear or who were performing improper acts, they were still not obliged to inform【C20】______a client to anyone, including the Swiss government. To some extent, therefore, the principle of secrecy had been maintained.