单项选择题A．The woman is going out to lunch. B．The woman wants to eat some chocolate. C．The woman will go to a convenience store. D． The woman will be back in 30 minutes.

单项选择题A．In San FranciscoB．At an airport. C． At a travel agencyD．In a post office.

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