第 31/100 题：If both the President and the Vice President can no longer serve, who becomes President? 如果总统和副总统都不能理事，则由谁成为总统？

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the President Pro Tempore 参议院临时议长
the Secretary of State 国务卿
the Speaker of the House 众议院议长
the Secretary of the Treasury 财政部长

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