题目内容
A biofuel is a fuel that is produced through contemporary _______ processes, rather than a fuel produced by _______ processes.
查看答案
搜索结果不匹配？点我反馈
更多问题
Renewable fuels can include fuels that are ______ from renewable energy sources
Human activities since the beginning of the Industrial Revolution have produced a ______ increase in the atmospheric concentration of carbon dioxide.
Global warming and climate change are terms for the observed century-scale rise in the ______ temperature of the Earth’s climate system and its related effects.
There are other forms of civil disorder — most _________, football hooliganism.
微信支付 
支付宝支付