单项选择题A．They migrate from North America to the Falkland Islands.B．They migrate only once during their lifetime.C．They migrate using what is apparently an inborn navigational ability.D．They migrate when they are freed from their cages.

单项选择题A．It publishes books with aid of computers.B．It only publishes children’’s books.C．It personalizes the books by having the computer make the reader the leading character in the story.D．It publishes books written by oneself.