Many of the speakers warned of the______ of the world order.
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This wasn’t just another______ of trendiness, but a kind of cinema vérité.
Those direct descendants of hunters and Hemingways,______ a primal capacity for friendship.
Buddies faced ______ together, but friends faced each other.
上下文无关文法包括()
A. 终结符号
B. 非终结符号
C. 开始符号
D. 产生式的集合
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