Every one of us must know： we live can we save the earth.
A. by changing the way only
B. only by changing the way
C. by only changing the way
D. by changing only the way
网友回答
A. by changing the way only
(答案→)B. only by changing the way
C. by only changing the way
D. by changing only the way
解析：考察倒装句。Only放在句首，且强调的是状语的时候，后面的主句使用部分倒装的形式，故B正确。句意：只有通过改变我们的生活方式，我们才能挽救地球。