The first one is the correct answer..no commas needed
To my mind, the correct answer is “to help the reader understand how the fuel system on a spacecraft works to help the reader understand the difficult decisions faced by Mission Control”. The aim of including a problem-solution text structure is to organize the author´s ideas in a way that helps the audience to gain understanding of the text. In addition, this device is very useful to call the attention of the audience and to make the text more appealing to them.
Answer:
Walden by Henry David Thoreau
A precursor to Granger's philosophy in Fahrenheit 451, Thoreau's classic account of the time he spent in a cabin on Walden Pond has inspired generations of iconoclasts to spurn society and take to the wilderness.
Gulliver's Travels by Jonathan Swift
Swift's satirical 1726 novel follows the journey of Lemuel Gulliver to a series of fanciful islands, none more improbable than the England he left behind. The Bradburian idea of using a distant world as a mirror to reflect the flaws of one's own society doesn't originate here, but this is one early expression of it.
"Dover Beach" by Matthew Arnold
Arnold's enduring poem about a seascape where "ignorant armies clash by night" has also lent lines to Ian McEwan's novel Saturday, and provided the title for Norman Mailer's Armies of the Night.
The Republic by Plato
The deathless allegory of the cave, where men living in darkness perceive shadows as truth, is unmistakably echoed in the world of Fahrenheit 451.
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