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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【C1】______in that they are both renewable.【C2】______, hydropower is more widely used than tidal. In【C3】______, a substantial amount of electricity is already produced in HEP (hydroelectric power)stations worldwide,【C4】______tidal stations are still in the very early【C5】______of development.
    As far as geographical【C6】______is concerned, HEP projects are to be found on lakes and rivers, while tidal【C7】______are constructed only at river mouths where tidal【C8】______is great. Unfortunately these are【C9】______in number. At present HEP stations are found mainly in Norway, Canada, Sweden and Brazil, whereas tidal plants are in【C10】______in France, Russia and China.
    As regards capital【C11】______, both require very high investment. On the other hand, generating【C12】______are quite low in both cases. In fact, a large scale HEP plant is capable of producing power more【C13】______than conventional sources, such as coal, oil and nuclear plants. Tidal power also compares【C14】______with nuclear and oil generated electricity,【C15】______the amount of money on production.【C16】______HEP stations, tidal constructions have a long life【C17】______. It is estimated that they can operate for over 100 years. With respect to【C18】______of supply, tidal stations【C19】______from HEP ones in that they often can only supply power【C20】______. HEP stations, however, provide a constant supply of electricity.
【C4】
选项 A、provided
B、since
C、whereas
D、though
答案C
解析 provided可作连词表示假如；since既然；whereas(用以比较或对比两个事实)然而，但是，尽管；though虽然。这里对水力发电站和潮汐电站的发展进行了对比，故选C。
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