Some countries are increasing their use of natural gas and other forms of . A. sourceB. e

问题补充：

Some countries are increasing their use of natural gas, and other forms of .

A. source

B. energy

C. power

D. material

答案：

A. source

(答案→)B. energy

C. power

D. material

解析：考查名词辨析。句意“一些国家正在增加天然气和其它类型能源的使用。”A“来源”；B“能源”；C“力量，权势，能力”；D“材料”。故选B。