题目内容
（请给出正确答案）
[主观题]
According to the author, words __________A. add shades of color to our social lifeB. are a
According to the author, words __________
A. add shades of color to our social life
B. are also a kind of assets to people
C. cannot be owned by speakers if not used
D. also compete with each other for survival
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