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  3. The passage gives a general description of the benefits and potential problems of a hydrogen economy. In the United States, mos

The passage gives a general description of the benefits and potential problems of a hydrogen economy. In the United States, mos

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问题 The passage gives a general description of the benefits and potential problems of a hydrogen economy.
In the United States, most of the electricity is generated from coal or natural gas.
选项 A、Y
B、N
C、NG
答案A
解析 在美国，电来自于煤和自然气的比例有多少? 根据上题出处下面的内容Where will the electricity for the electrolysis of water come from?可以发现Currently，about 68 percent of the electricity produced in the United States comes from coal or natural gas．而about 68 percent表明大部分电都来源于煤和天然气。
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大学英语四级

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