To live a low-carbon life , we must try to save energy and produce carbon .
A. more , less
B. less , more
C. more , fewer
D. most , least
网友回答
(答案→)A. more , less
B. less , more
C. more , fewer
D. most , least
解析：energy，carbon 为不可数名词,more和less，后接不可数名词，又根据意思，故选答案为A。