Fish farming promises to be a good way to produce large quantities of food. The culture of fish and shellfish (贝类动物) is an ancient skill practised in the past mainly by Oriental people, including people in China.

　　Besides oil and gas, the sea may offer new sources of energy. Experts believe that the warm temperature of the ocean can be used in a way similar to the steam in a steamship. Ocean currents and waves offer possible use as a source of energy.

　　Technology is enabling man to explore ever more deeply under the sea. The development of strong, new materials has made this possible.

　　The technology to harvest the sea continues to improve. Experts believe that by the year 2020 the problems that prevent us from exploiting（开发） fully the food, minerals, and energy sources of the sea will be largely solved.

　　67．Valuable amounts of minerals are ______.

　　A. in the ocean water

　　B. in the warm ocean water

　　C. on the sea coast

　　D. on the ocean floor

　　68．We can conclude from this passage that ______.

　　A. the sea resources have largely been used up

　　B. the sea, in the broad sense, has not yet been developed

　　C. the problems that prevent us from using the food, minerals, and energy sources of the sea have already been solved.

　　D. by the year 2020 , the technology will be good enough to exploit all the sea resources

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