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)_______________________. Producing food from farms under the sea is a possibility in the future. Food grown in the sea could help solve the problem of many of the world's people who go hungry every day.(2)________________________________.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.(3)_______________________.
发表于 2015-12-7 11:06
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