四级练习2013.02.24
[audio]http://sound.yywz123.com/tingbbs/cet4/cet420130224.mp3[/audio]The floor of the ocean contains many riches that can be used by human beings.Oil and some chemicals and minerals are already taken from the sea.(1)_______________________.Food grown in the sea could help solve the problem of many of the world's people who go hungry every day.About ten to fifteen percent of the world's people do not have enough food.Some scientists believe that some day the sea will be used to make electric power.This would help meet the need for more power for world's industries.(2)_______________________.
**** Hidden Message ***** 1\By using nuclear energy ocean water can return into fresh water by removing the solid.
2\The decreasing supply of coal,oil and gasoline shows the need of finding new power is urgent
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