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

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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
【C13】

选项

答案I

解析 通过分析此处的句子结构可知,空格处需填入分词形式,该分词需要跟介词in构成搭配,一起作 $93 million for wind energy development的后置定语。空格后的内容是一项法案,由此可以推断,风能开发的投资应该是被包含在法案当中的。因此I选项included符合句意,be included in意为“被包含在……内”。故I为正确答案。
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