According to entomologists, single locusts are quiet creatures, but when locusts are placed with others of their species, they become excited, change color, vibrate, and even hum.
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Awhen locusts are placed with others of their species,
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Bwhen placing them with others of their species, then
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Clocusts, when placed with others of their species,
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Dplacing them with others of their species,
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Eplaced with others of their species, then
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正确答案: A