【简答题】Over three centuries English gradually swallowed French, and by the end of the 15th century what had developed into being was a modified, greatly __________ (丰富了的中古英语).
【简答题】To design and build a spacecraft, you need to be able to find out how big you can make it, how heavy it can be, how fast it will have to go, how much fuel( 燃料 ) it needs and so on. For that, you need ...