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  3. With the world’ s population estimated to grow from six to nine billion by 2050, researchers, businesses and governments are alr

With the world’ s population estimated to grow from six to nine billion by 2050, researchers, businesses and governments are alr

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问题    With the world’ s population estimated to grow from six to nine billion by 2050, researchers, businesses and governments are already dealing with the impact, this increase will have on everything from food and water to infrastructure and jobs. Underling all this【C6】______will be the demand for energy, which is expected to double over the next 40 years.
   Finding the resources to meet this demand in a【C7】______, sustainable way is the cornerstone of our nation’ s energy security, and will be one of the major【C8】______of the 21st century. Alternative forms of energy-bio-fuels, wind and solar, to name a few are【C9】______being funded and developed, and will play a growing【C10】______in the world’ s energy supply. But experts say that even when【C11】______, alternative energy sources will likely meet only about 30% of the world’ s energy needs by 2050.
   For example, even with【C12】______investments, such as the $ 93 million for wind energy development【C13】______in the American Recovery and Reinvestment Act, important alternative energy sources such as wind and bio-fuels【C14】______only about 1 % of the market today.
   Energy and sustainability experts say the answer to our future energy needs will likely come from a lot of【C15】______both traditional and alternative.
   [A]consist[B]solutions[C]certainly
   [D]stable[E]comprise[F]competitions
   [G]exactly[H]growth[I]included
   [J]role[K]progress[L]marvelous
   [M]challenges[N]combined[O]significant
【C7】
选项
答案D
解析 根据空格前的冠词a和逗号后的sustainable一词可知，空格处需填入形容词，与sustainable并列共同修饰名词way，且与sustainable语义相近。D选项stable“稳定的”与sustainable“可持续的”语义相近，符合语境，故D为正确答案。
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