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  3. What is most remarkable about the proposal made by the two scientists? What is the biggest problem with hydrogen-powered cars?

What is most remarkable about the proposal made by the two scientists? What is the biggest problem with hydrogen-powered cars?

admin2008-07-06  86
问题 What is most remarkable about the proposal made by the two scientists?
What is the biggest problem with hydrogen-powered cars?
选项 A、There is no cheap source of hydrogen.
B、There might be a safety problem in hydrogen production.
C、They may still be a cause of global warming.
D、They are not suitable for long-distance travel.
答案C
解析 第三段中说：Hydrogen-powered cars emit no carbon dioxide，but producing hydrogen requires energy，and if that energy comes from coal-fired power plants，then the problem has not been solved．意为：氢气动力车不会释放二氧化碳，但产生氢气需要能量，如果这能量是来自火力发电厂，那还是无法解决问题。由此可知C项为正确答案，其他选项为干扰项。
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