An ‘amazing feat’: how was a 13-year-old boy able to swim for four hours to save his
family?
(Fight-or-flight: used to describe the reaction that people have to a dangerous situation, that makes them
either stay and deal with it, or run away)
(Available at: https://www.theguardian.com/australia-news/2026/feb/05/austin-appelbee-13-year-old-boyswims-four-hours-rescue-save-family-western-australia – text specially adapted for this test).
In the sentence “But for activities lasting hours – in the case of Austin’s swim –
‘eventually these systems do get depleted’” (l. 23-24), the expression “these systems” refers to:
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