The rising action of a story is the section of the plot leading up to the climax, in which the tension stemming from the story's central conflict grows through successive plot developments.
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From the title? Basically, one can infer that Golding believes that when left without rules and punishments, civilization is reduced to anarchy and people behave like animals, sometimes doing vulgar things to one another that they would usually never do in a functional society.
Answer:
17. metaphor
18. idiom
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