The article gives several about why we should build up the harmonious society.
A. explanations
B. expressions
C. introductions
D. directions
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(答案→)A. explanations
B. expressions
C. introductions
D. directions
解析：句意：这篇文章给出了几种解释关于我们为什么要建立和谐的社会。Explanations解释；expressions表情；introductions介绍；directions说明。根据句意故选A。