28. Be careful! The slightest spark（火花）could ______ the fireworks.

   A. set about      B. set off        C. set out         D. set up

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科目：高中英語 來源：學習高手必修三英語人教版 人教版 題型：022

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When you travel in a forest, you should be carefu _________ snakes and some other wild animals．

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