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  3. Possible Breakthrough in Renewable Energy Plant scientists at the University of Michigan (90) an intriguing breakthrough.

Possible Breakthrough in Renewable Energy Plant scientists at the University of Michigan (90) an intriguing breakthrough.

admin2012-04-26  91
问题             Possible Breakthrough in Renewable Energy
    Plant scientists at the University of Michigan  (90)   an intriguing breakthrough. They are excited about a new breed of plant that can produce very high energy yields. The plant, which is a cross-breed of corn, wheat and barley, was originally made for another  (91)  .
    The scientists were initially trying to develop a new feed crop for cattle. While the crop was a failure as cattle feed, additional testing showed that it had excellent biofuel properties.
    Currently, the crop is in the experimental stage. Scientists need to do  (92)   work to determine under what conditions the plant grows best. This testing will be finished soon, and the plant should be out of the laboratory and in field trials by the end of the year.
选项 A、option
B、purpose
C、extent
D、device
答案B
解析 purpose目的，用途
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