According to the author, Mr. Arnold Schwarzenegger is cheerful chiefly because Corn-based ethanol might not be chosen as an alt

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问题 According to the author, Mr. Arnold Schwarzenegger is cheerful chiefly because
Corn-based ethanol might not be chosen as an alternative because

选项 A、carbon reduction in both fuel production and burning might be hard.
B、California also intends to cut down emissions from new vehicles.
C、it is almost impossible for vehicle fuel to produce 10% less carbon.
D、California’s corns are chiefly transported by cars and trucks.

答案A

解析 原因细节题。定位在第三段尾句。第三段尾句说"施瓦辛格下令到2020年交通燃料必须减少10%的碳释放量:在生产燃料和燃烧燃料两个方面都达到这个标准,因此,简单地转向以玉米为主料的酒精燃料就不太可能了"。由此可见,原因在于"在燃料生产和燃烧两方面减少碳排放可能很困难"。
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