1. 根据本段内容“More than 150 years ago, wood supplied up to 90% of our energy needs. As the use of coal, petroleum, and natural gas expanded, the US depended less on wood as an energy source. Today, we are looking again at renewable sources to find new ways to use them to ...
A. They are more expensive. B. They are less sustainable. C. They can provide a more stable and reliable source of power. D. They increase our reliance on fossil fuels. 相关知识点: 试题来源: 解析 C。解析:文章中提到可再生能源不仅更清洁、更可持续,而且有潜力提供更稳定可靠的能源,所以答案...
Everyone is affected by a third factor: renewable energy has negligible or zero marginal running costs—because the wind and the sun are free. In a market that prefers energy produced at the lowest short-term cost, wind and solar take business from providers that are more expensive to run, ...
A. They are expensive. B. They produce harmful emissions. C. They are clean and do not produce harmful emissions. D. They are only available in certain areas. 相关知识点: 试题来源: 解析 C。中文解析:可再生能源的主要优势之一就是清洁,不会产生有害排放物或污染物。A 选项说它们昂贵,与文章中...
Renewable Energy __{1}__ More than 150 years ago, wood supplied up to 90% of our energy needs. As the use of coal, petroleum, and natural gas expanded, the US depended less on wood as an energy source. Today, we are looking again at renewable sources to find new ways to use ...
There are many pros and cons to renewable energy compared to traditional sources - from financial savings to environmental benefits.
A. dirty and unsustainable B. expensive and difficult to use C. clean and sustainable D. limited and unreliable 相关知识点: 试题来源: 解析 C。解析:文章中提到“One solution is to increase the use of renewable energy sources such as solar and wind power. These sources are clean and sustaina...
(翻两番)worldwide between 1999 and 2005.Modern wind farms consist of turbines that generate electricity.Though it will be more expensive,there is more than enough wind to provide the world’s entire energy needs.Wind farms come in onshore and offshore forms.They can often end up at spots ...
Though it will be more expensive, there is more than enough wind to pro-vide the world&39;s entire energy needs. Wind farms come in onshore and offshore forms. They can of-ten end up at spots of natural beauty, and are often unpopular with residents. And turbines are nottotally ...
A. They are expensive. B. They are unlimited. C. They cause pollution. D. They are difficult to obtain. 相关知识点: 试题来源: 解析 B。解析:使用可再生能源的主要优势是它们是无限的。选项 A 错误,可再生能源不一定昂贵;选项 C 错误,可再生能源通常不会造成污染;选项 D 错误,可再生能源并不一定...