Answer:
https://dokumen.pub/sample-return-missions-the-last-frontier-of-solar-system-exploration-1nbsped-0128183306-9780128183304.html
Explanation:
The answer is alliteration.
—Evidence—
•-Alliteration definition: the occurrence of the same letter or sound at the beginning of adjacent or closely connected words.
•- In the first part where it says “Today’s class will be silly, simple and singlehandedly...” it mentioned the same letter which is the letter S.