Final answer:
Without access to a specific musical score or recording, it is not possible to determine the exact number of statements of the bassoon ostinato during the first presentation of the text in 'Dido's Lament'.
Step-by-step explanation:
The question refers to the composition 'Dido's Lament' from the opera Dido and Aeneas by Henry Purcell, specifically the bassoon ostinato that underscores Dido's aria 'When I am laid in earth'. The bassoon ostinato is a repetitive musical phrase that provides the foundation over which the vocal line is sung. Unfortunately, without a specific musical score or audio recording to reference, we cannot determine how many statements of the bassoon ostinato are heard during the first presentation of the text 'When I am laid in earth, may my wrongs create, no trouble in thy breast'.