文章来源于《晨读英语美文》Suppose someone gave you a pen---a sealed, solid-colored pen.You couldn’t see how much ink it had. It might run dry after the first few tentative words or last just long enough to create a masterpiece (or several ) that would last forever and make a difference in the scheme of things. You don’t know before you begin. Under the rules of the game, you really never know .You have to take a chance!Actually, no rule of the game states you must do anything. Instead of picking up and using