单项选择题How many revolutions must the largest cog make in order to bring the cogs back to their original positions

单项选择题BONA FIDE is to genuine as DE FACTO is to________.

单项选择题What letter should replace the question mark

单项选择题Sally had a third again as many as David, who had a third as many again as Francis. Altogether they had 111. How many did David have

单项选择题That extremely indolent student will clean out his desk when pigs fly or I am much mistaken as to his character.