Final answer:
The central idea of the excerpt is the theme of friendship and trust.
Step-by-step explanation:
The central idea of the excerpt “Double Date” by R.L. Stine is the theme of friendship and trust. The story revolves around two girls, Brittany and Darcy, who plan a double date with two boys they meet on a computer bulletin board. However, their friendship is tested when they discover that the boys are not who they claimed to be.
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