Spoken in 3 clips from 3 channels · B2–C1 · other forms: perks, perked
01 / 3SciShow≈ approximate level B29:01–9:04 .
02 / 3TED-Ed≈ approximate level B22:54–3:00
.
03 / 3CrashCourse≈ approximate level C15:50–6:00
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Keep “perk” until you know it
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3 clips · 3 channels Also heard in these clips