To reduce emissions of greenhouse gases, many countries are increasing the use of natural gas, wind and other forms of energy.
A. abandoned
B. original
C. alternative
D. precious
网友回答
A. abandoned
B. original
(答案→)C. alternative
D. precious
解析:A. abandoned被放弃的,被遗弃的,热情洋溢的,B. original 最初的,原始的,C. alternative可替换的,可供选择的, D. precious珍贵的,句意:为了减少温室气体的排放,很多国家在增加天然气,风和其他可替代能源的使用。所以选C。