Question 75

Astronauts who stayed for an ____________ period of time at the International Space Station displayed a remarkable level of ____________ endurance and mental____________.

The sentence describes astronauts who spent a long time in space and demonstrated notable strength both physically and mentally. The blanks need to convey the duration of their stay and their impressive endurance and mental strength.

Of the choices given, "extended" correctly describes a long period of time, "physical endurance" reflects the astronauts' bodily strength in space, and "mental resilience" captures their psychological strength. All three words fit naturally and accurately with the sentence’s meaning. 

Option A:[Extensive; dysfunctional; agility] is contradictory—“dysfunctional” implies weakness, which clashes with the idea of impressive endurance. Option B:[Explicit; stoic; integrity] is awkward (explicit period of time). Option C:[Expanded; stern; acuity] sounds forced and unnatural, and “acuity” refers to sharpness of perception, not endurance. Only Option D:[extended; physical; resilience] completes the sentence smoothly and meaningfully. This makes D the best choice.

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