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補(bǔ)全短文 

The riches of the sea yet to be developed by man‘s technology are impressive. Oil and gas explorations have existed for nearly thirty years. Valuable amounts of minerals such as iron， copper and so on exist on the ocean floor.

According to the author， technology is important because ______.

A.resources on land are running short in ten years

B.man can use it to explore the deeper sea

C.it is a lot of fun diving into the sea

D.ancient people used it to explore the sea

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