Try this ASVAB-style question.

During a power outage, a grocery store kept refrigerator doors closed. Cold air escaped more slowly, helping food remain at a safe temperature longer. Employees opened a unit only when an item was urgently needed. What is the author’s primary purpose?

1. Employees opened a unit only for urgent items.
2. Frequent door opening would warm the refrigerators faster.
3. To describe a method for protecting refrigerated food during an outage.
4. Keeping refrigerator doors closed preserved cold air.