Adapted from The Story of Mankind by Hendrik Van Loon (1921)

Early humans did not know what time meant, but in a general way they kept track of the seasons. They had noticed that the cold winter was invariably followed by the mild spring—that spring grew into the hot summer when fruits ripened and the wild ears of corn were ready to be eaten and that summer ended when sudden gusts of wind swept the leaves from the trees and a number of animals were getting ready for the long hibernal sleep.

But now, something was the matter with the weather. The warm days of summer had come very late. All the time the days grew shorter and the nights grew colder than they ought to have been.

It began to snow. It snowed for months and months. All the plants died and the animals fled in search of the southern sun. The early humans hoisted their young upon their backs and followed them. But they could not travel as fast as the wilder creatures and he were forced to choose between quick thinking or quick dying. They seem to have preferred the former, for they have managed to survive the terrible glacial periods which threatened to kill every human being on the face of the earth.

First, it was necessary that early humans clothe themselves lest they freeze to death. They learned how to dig holes and cover them with branches and leaves, and in these traps they caught animals, which they then killed with heavy stones and whose skins they used as coats for himself and their families.

Next came the housing problem. This was simple. Many animals were in the habit of sleeping in dark caves. The early humans now followed their example, drove the animals out of their warm homes and claimed them for their own.

In this way thousands of years passed. Only the people with the cleverest brains survived. They had to struggle day and night against cold and hunger. They discovered fire. They were forced to invent tools. They learned how to sharpen stones into axes and how to make hammers. They were obliged to put up large stores of food for the endless days of the winter and they found that clay could be made into bowls and jars and hardened in the rays of the sun. And so the glacial period, which had threatened to destroy humanity, became its greatest teacher because it forced humans to use their brains.

The primary purpose of this passage is __________.

"Addictions" by Matthew Minerd (2013)

Addictions come in many forms, often quite hidden from those who should be aware of them. It is helpful to be aware of how hidden these obsessive behaviors can be. Often, they appear to be harmless, but this appearance is deceptive.  Perhaps several examples can assist in increasing the reader’s awareness of these potentially problematic habits. 

A very simple example of such an apparently innocuous addiction is the addiction that many people have to a beverage like coffee. While not as destructive as an addiction to alcohol, an extreme need for caffeine often covers a need for more sleep or an overzealous desire to be completely energetic at every waking moment. Also, a great deal of caffeine can potentially do damage to one’s heart due to the stress caused by its stimulating effects. 

Another example of a seemingly harmless addiction can be found in the case of people who are addicted to work. It is very tempting to praise such obsessive behavior, as it provides many benefits for others and even for the one doing the work. The advancement of a career certainly seems beneficial and often allows for great personal and financial fulfillment. Nevertheless, constant work often hides some sadness, insecurity, or fear that should be confronted by the person who slaves away without cessation. Likewise, over time, such continuous work often can be greatly destructive of important personal relationships.

Of course, many more examples could be brought forth, for one can obsess over almost anything. Still, even these two simple examples should make clear to the reader that it is possible for there to be apparently harmless—indeed, seemingly helpful—life practices that in reality can pose a potential harm to one’s physical or mental well-being.

What is the purpose of the second and third paragraphs?

"Addictions" by Matthew Minerd (2013)

Addictions come in many forms, often quite hidden from those who should be aware of them. It is helpful to be aware of how hidden these obsessive behaviors can be. Often, they appear to be harmless, but this appearance is deceptive. Perhaps several examples can assist in increasing the reader’s awareness of these potentially problematic habits. 

A very simple example of such an apparently innocuous addiction is the addiction that many people have to a beverage like coffee. While not as destructive as an addiction to alcohol, an extreme need for caffeine often covers a need for more sleep or an overzealous desire to be completely energetic at every waking moment. Also, a great deal of caffeine can potentially do damage to one’s heart due to the stress caused by its stimulating effects. 

Another example of a seemingly harmless addiction can be found in the case of people who are addicted to work. It is very tempting to praise such obsessive behavior, as it provides many benefits for others and even for the one doing the work. The advancement of a career certainly seems beneficial and often allows for great personal and financial fulfillment. Nevertheless, constant work often hides some sadness, insecurity, or fear that should be confronted by the person who slaves away without cessation. Likewise, over time, such continuous work often can be greatly destructive of important personal relationships.

Of course, many more examples could be brought forth, for one can obsess over almost anything. Still, even these two simple examples should make clear to the reader that it is possible for there to be apparently harmless—indeed, seemingly helpful—life practices that in reality can pose a potential harm to one’s physical or mental well-being.

What is the intention of the author of this passage?