31.What' s the purpose of thetext？
A. To stress the importance of breaking.
B. To make a brief historical overview of breaking.
C. To throw light on the rules of breaking.
D. To.introduce a new Olympic event- breaking.
Mars was once wet, with an ocean's worth of water on its surface. Today, most of Mars is as dry as a desert except for ice deposits in its polar regions. Where did the rest of the water g
Some of it disappeared into space. Water molecules, beaten by particles of solar wha, broke apartinto hydrogen and. oxygen atoms, and those, especially the lighter hydrogen atoms, sped out of the atmosphere, lost to outer space..
