2. 外语
  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 have on everything from food and water to infrastructure (基础设施) and jobs. Underlying all this【S1】______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【S2】______. sustainable way is the cornerstone (基石) of our nation’s energy security, and will be one of the major【S3】______of the 21st century. Alternative forms of energy — bio-fuels, wind and solar, to name a few — are【S4】______being funded and developed, and will play a growing【S5】______in the world’s energy supply. But experts say that, even when【S6】______, alternative energy sources will likely meet only about 30% of the world’s energy needs by 2050.
    For example, even with【S7】______investments, such as the $93 million for wind energy development【S8】______in the American Recovery and Reinvestment Act, important alternative energy sources such as wind and bio-fuels【S9】______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 【S10】______— both traditional and alternative.
[A] stable               [F] marvelous                   [K] comprise
[B] solutions            [G] included                    [L] competitions
[C] significant          [H] growth                      [M] combined
[D] role                 [I] exactly                     [N] challenges
[E] progress             [J] consist                     [O] certainly
【S9】
选项
答案K
解析 分析空所在的句子结构可知，本句缺少谓语，由该句的主语important．．．sources以及前后文的一般现在时态可知，本空应填一原形动词，[E]、[J]和[K]入选。由后面提到的“当今市场的1％”可知，此处应该是说重要的替代能源在市场所占的份额，故答案为[K]comprise“组成，构成”，常用来表示部分构成整体，主语为部分。[J] consist“包含，包括”常用来表示整体包含部分，主语为整体。
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大学英语四级

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