The author's purpose in this excerpt was to describe the struggle and necessity of their tent.
True. Most essays are written to be presented to a certain audience whether it’s a group of students or a general audience or to a teacher.
Checked out
Checked out is not domain specific language. When talking about medical visits, checked out is an informal term for having a medical evaluation. A check-up is a routine procedure done yearly that is normally called a physical in the medical field. A fall is a fall. There is no other domain specific vocabulary that can change this. Clinic and injuries are all typical domain specific terms that can be applied in medical situations.
Based on these lines from"the gorgon's head" by nathaniel hawthorne is an imperative sentence is: b. "be careful that they do not see you before you see them".
the "imperative" sentence is a command, so i think it's the answer b.
hope this help