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【单选题】
In the ancient world, as is today, most boys played with some kinds of toys and most girls with another. In societies where social roles are rigidly determined, boys pattern their play after the activities of their fathers and girls after the tasks of their mothers. This is true because boys and girls are being prepared, even in play, to step into the roles and responsibilities of the adult world. Q:The reason why the toys most boys play with are different from those that girls play with is that____.A.
their social roles are rigidly determined
B.
most boys would like to follow their fathers professions
C.
boys like to play with their fathers while girls with their mothers
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【单选题】下列关于交易，结算，财务数据保存或备份的表述，错误的是( )。
A.
期货公司以电子数据方式保存或者备份相关资料的，保存的电子数据资料应当能随时转化为纸质形式
B.
期货公司应当定期将交易、结算、财务数据提交期货交易所集中保存和备份
C.
期货公司以电子数据方式保存或者备份相关资料，应当确保电子数据的真实，可靠
D.
期货公司应当建立交易、结算、财务数据的备份制度