Part a: “nearly 3.5 million refugees live in tents; millions more live in makeshift shelters of plastic sheeting. neither kind of shelter is likely to last for more than a year, if that” how do these sentences develop a key concepts of the article?
a. they introduce the need for shelters to last longer.
b. they show how living in shelters can be dangerous.
c. they highlight the increasing amount of space that people need in shelters.
d. they explain why shelters are more effective when they are replaced frequently.