A-A+
The biggest problem with hydrogen-powered cars
问题详情
The biggest problem with hydrogen-powered cars is that______.
A．there is no cheap source of hydrogen energy
B．they may still be a cause of global warming
C．safety problems might occur in hydrogen production
D．they are not suitable for long-distance travel请帮忙给出正确答案和分析，谢谢！
参考答案
正确答案：B
解析：根据题干中的hydrogen-powered cars将本题出处定位到第八段。该段提到，氢气动力汽车不排放二氧化碳，但是制造氢气需要大量能量，且如果这种能量来源于火力发电厂，那么，问题还是不能得到解决。由此可知，如果制造氢气需要的能量来源于排放二氧化碳的火力发电厂，那么氢气动力汽车还是会造成全球变暖，故答案为[B]。其余三项在文中未提及。
