问题
选择题
As there is less and less coal and oil, scientists are exploring new ways of making use of ____ energy, such as sunlight, wind and water for power and fuel.
A．original
B．alternative
C．convenient
D．staple
答案
答案：B
形容词辨析。A原始的；B替代的;供选择的；C便利的；D经常需要的;经常用的；结合句意可知B正确。句意：因为煤炭和石油越来越少，科学家正在寻找新方法利用替代能源。