People often want their life to go perfectly, but accept the that nothing on the earth is flawless.
A. reality
B. quality
C. identity
D. responsibility
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(答案→)A. reality
B. quality
C. identity
D. responsibility
解析：A. reality现实，B. quality 质量，C. identity身份，D. responsibility责任，句意：人们经常希望生活完美，但是接受现实世界上没有什么是完美无缺的。所以选A。