四级阅读选词填空题的两原则和五“定”法

all this 47 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 48, sustainable way is the cornerstone (基石) of our nation’s energy security, and will be one of the major 49 of the 21st century. Alternative forms of energy—bio-fuels, wind and solar, to name a few—are 50 being funded and developed, and wil
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