Cockroaches are so repulsed by humans that if they are touched by a human not only do they ran away, but also wash themselves. Вопрос! почему в первом предложении passive voice а не repulse
Cockroaches are so repulsed by humans that if they’re touched by one, not only do they run away, they also wash/clean themselves (off).
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You can also state this as “Humans repulse cockroaches so much that…”. But the passive sounds more idiomatic and emotive because it focuses on the reaction of the roach instead of the human’s touch and its effect.