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  3. In addition to the established energy sources such as gas, coal, oil and nuclear, there are a number of other sources that we ou

In addition to the established energy sources such as gas, coal, oil and nuclear, there are a number of other sources that we ou

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问题     In addition to the established energy sources such as gas, coal, oil and nuclear, there are a number of other sources that we ought to consider. Two of these are hydroelectric and tidal power.
    These two sources are【21】______ in that they are both renewable. 【22】______ , hydropower is more widely used than tidal. In【23】______ , a substantial amount of electricity is already produced in HEP (hydroelectric power)stations worldwide, 【24】______ tidal stations are still in the very early【25】______ of development.
    As far as geographical【26】______ is concerned, HEP projects are to be found on lakes and rivers, while tidal【27】______ are constructed only at river mouths where tidal【28】______ is great. Unfortunately these are【29】______ in number. At present HEP stations are found mainly in Norway, Canada, Sweden and Brazil, whereas tidal plants are in【30】______ in France, Russia and China.
    As regards capital【31】______ , both require very high investment. On the other hand, generating【32】______ are quite low in both cases. In fact, a large scale HEP plant is capable of producing power more【33】______ than conventional sources, such as coal, oil and nuclear plants. Tidal power also compares【34】______ with nuclear and oil generated electricity, 【35】______ the amount of money on production. 【36】______ HEP stations, tidal constructions have a long life【37】______ . It is estimated that they can operate for over 100 years. With respect to【38】______ of supply, tidal stations【39】______ from HEP ones in that they often can only supply power【40】______. HEP stations, however, pro vide a constant supply of electricity.  
【27】
选项 A、patterns
B、designs
C、plans
D、schemes
答案C
解析 pattern图案；design设计图样；plan规划；scheme方案。这里指的是为潮汐电站做出规划，排除A和B项。虽然plan和scheme都有计划、方案的意思，但是plan还有“规划”的意思，即在某事真正进行之前已经详细考虑了实施步骤，故选C。
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