How does the author of the editorial "It's Time for a Nation to Return the Favor" argue for his or her claim that the federal government should help
protect New Orleans?
A. By demonstrating that Congress does not live up to its
responsibilities.
B. By showing that all Americans benefit from what goes on in New
Orleans.
C. By explaining that New Orleans contains a lot of poor and elderly
people.
D. By pointing out that all American cities are dangerous places.

answer: b (host)

viruses use the cells of living organisms to reproduce. the cell which is used by virus is called as "host cell". it is a living cell in which virus multiplies, example bacteria, plant or an animal cell.

in this, the virus is a parasite, which uses host cell for its benefit (reproduction) by using the cell machinary of host cell.

the pronoun reference replaces a noun, but you have to make sure there's no room for confusion.

in the first sentence "her" could be referring to shely or to the sister. the answer there is "shelly called her sister and told her about the new baby."

in the second sentence "it" could be referring to the roof or the floor. the answer there is "since the roof leaks on the family room floor, we need to repair the roof."

the words “strangest” and “unusual” suggest that the narrator is about to tell the story of an odd or puzzling group of people.