Being kind to others should be everyone’s of life. ,our world will be more peaceful and beautiful.
A. aim;If so
B. standard;If that
C. belief;Even so
D. principle;If so
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A. aim;If so
B. standard;If that
C. belief;Even so
(答案→)D. principle;If so
解析：principle of life 生命的原则；if so 如果那样的话。