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exponential
mastery/ˌɛk.spəˈnɛn.t͡ʃəl/adjnoun
card 1 of 10 · fill in the blank
Ebola seems to be spreading at an _____ rate, which is very worrying.
card 1 of 10 · fill in the blank
Ebola seems to be spreading at an _____ rate, which is very worrying.