Final answer:
The first pause in the speech is caused by an external interruption, such as the ringing of a cell phone, which disrupts the flow and impacts the fluency of the performance.
Step-by-step explanation:
The first pause in the speech seems to be caused by external interference, such as a cell phone ringing, which disrupts the flow of the presentation or performance. This aligns with the text suggesting a need for the audience to turn off cell phones. The inclusion of pauses within a speech, deliberate or accidental, impacts fluency and can either enhance the dramatic effect or cause disruptions, detracting from the speaker's message. Intentional pauses, like those used in poetry or for emphasis within a speech, contrast with those caused by fluency issues, which may occur if the speaker forgets a point or becomes distracted.