69．It can be inferred from the passage that most icebergs . A．become part of glaciers
B．drift toward the polar region C．melt in the oceans
D．move in whichever direction the wind is blowing
70．Which of the following ideas would the author be most likely to agree with?
A．Towing icebergs to dry arcos is economically passable. B．Removing salt is the best way to obtain fresh water.
C．Preventing icebergs from melting costs more than desalination.