十五选十做题要点

For example, even with significant 53________ investments, such as the $93 million for wind energy development 54________ in the included American Recovery and Reinvestment Act, important alternative energy sources such as comprise wind and bio-fuels 55________ 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 solutions 56________ --- both traditional and alternative.
两个副词，exactly和

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. Underlying all this 47_ growth will be the demand for energy, which is expected to double over the next 40 years.
Alternative
forms of energy --- biofuels, wind and solar, to name a certainly few --- are 50________ being funded and developed, and will role play a growing 51________ in the world’s energy supply.
Finding
the resources to meet this demand in a 48________, stable sustainable way is the cornerstone of our nation’s energy security, and will be one of the challenges major 49________ of the 21st century.
十五选十做题要点
一
标注词性，预先分组 二 浏览全文，预测答案 三 同性比较，选择唯一

（词的褒贬色彩，平行结构，单复数，时态 ）
四 带入选项，通读检查
如果是名词： 语法上作主语或宾语，形式上前有冠词或形容 词。 如果是动词： 语法上做谓语，形式上前有情态动词；前有代 词、名词、名词性短语，后有副词或介词短语；被 动语态；做分词；非谓语(不定式或by后面)等五种 情况。 如果是形容词： 语法上做表语或宾语补足语，形式上后有名词； 前有副词两种情况。 如果是副词： 语法上就是修饰成分，形式上后有形容词；动 词和介词之间；助动词或者情态动词和主动词之间 三种情况。

certainly， 三个形容词，stable、significant、 marvelous 动词：included, combined (-ed 形式) comprise， consist (原型） 名词： role, progress, growth (原型） solutions, challenges, competitions （ 复数）
But
experts say that, even when combined 52________, alternative energy sources will likely meet only about 30% of the world’s energy needs by 2050.
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