单选题
（浙江大学2008年试题） Since the early 1930s, Swiss banks had prided themselves on their system of banking secrecy and numbered accounts. Over the years, they had successfully【1】every challenge to this system by their own government who,【2】, had been frequently urged by foreign governments to reveal information about the financial affairs of certain account【3】. The result of this policy of secrecy was【4】a kind of mystique had grown up around Swiss banking. There was a widely-held belief that Switzerland was【5】to wealthy foreigners, mainly because of its numbered accounts and bankers' reluctance to ask awkward questions【6】depositors.【7】to the mystique was the view that if this secrecy was ever given up, foreigners would fall over themselves in the rush to【8】money, and the Swiss banking system would virtually collapse overnight. To many,【9】, it came like a bolt out of the【10】, when, in 1977, the Swiss banks announced they had signed a【11】with the Swiss National Bank(the Central Bank). The aim of the agreement was【12】the improper use of the country's bank secrecy laws, and its【13】was to curb severely the system of secrecy. The rules which the banks had agreed to observe【14】the opening of numbered accounts subject to much closer【15】than before. The banks would be required, if necessary, to【16】the origin of foreign funds going into numbered and other accounts. The idea was to stop such accounts being used for【17】purposes. Also, they agreed not to accept funds resulting from tax【18】or from crime. The pact represented essentially a tightening up of banking rules.【19】the banks a-greed to end relations with clients whose identities were unclear or who were performing improper acts, they were still not obliged to inform【20】a client to anyone, including the Swiss government. To some extent, therefore, the principle of secrecy had been maintained.