听短文，选择正确答案．
（1）What do many places in the world need today？
A．More sea water．
B．More clean water．
C．More fresh water．
（2）How many ways does this passage tell us to get fresh water from the sea water？
A．One．
B．Two．
C．Three．
（3）Which way costs more money， but works faster than the sun？
A．The way of heating the sea water．
B．The way of making the sea water cold．
C．Neither of the above．
（4）What does the passage mainly talk about？
A．What do many places in the world need．
B．Why to turn salt water into fresh water．
C．How to turn salt water into fresh water．
（5）Which way is the best to get more fresh water？
A．Heating the sea water．
B．Making the sea water below zero．
C．The way to spend the least money but to get the most fresh water．