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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 alre

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 (基础设施) 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 (基石) 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 2049.
    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] stable      [B] solutions
    [C] significant [D] role
    [E] progress    [F] marvelous
    [G] included    [H] growth
    [I] exactly     [J] consist
    [K] comprise    [L] competitions
    [M] combined    [N] challenges
    [O] certainly
【C14】
选项
答案K
解析 此处需填入谓语动词, 结合复数形式的主语alternative energy sources和句末的today, 可知此处应该是动词原形。comprise和consist均有“包含, 组成”之义, 但consist需后接介词of才能跟宾语, 故选Comprise。
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