Answer:
1. A model railroad is a miniature imitation of an actual train.
2. The assembly of a railroad kit is a difficult task.
3. A model railroad is a pleasant hobby.
Step-by-step explanation:
Articles are actually adjectives because they describe the nouns that they precede. In English, there are only three articles: the, a, and an. However, the three are not interchangeable; rather, they are used in specific instances.
Your articles are in bold, as I could not circle them.