Final answer:
Roza was sleeping at the beginning of the chapter entitled Jump, which is the answer to the student's query.
Step-by-step explanation:
At the beginning of the chapter entitled Jump, Roza was sleeping. This is the answer to the question about what Roza was doing. If we consider the broader context you're asking about, regarding Alzheimer's disease and the areas of the brain it affects, we would look at common symptoms such as memory loss, confusion, and difficulty with coordination or language. These symptoms might indicate that parts of the brain like the hippocampus, which is crucial for memory and learning, and the cerebral cortex, which is responsible for complex brain functions such as thinking and planning, are affected by Alzheimer's.