What is the topic of the composition for the 21 Shaanxi College Entrance Examination?

In p>21, the college entrance examination in Shaanxi chose the form of material composition, gave three materials, and asked students to write an 8-word composition.

The content of the material is roughly as follows: 1. Put a fish in a fish tank, and it can only grow to 3 inches; Living in the sea is reasonable, but it can grow up to 3 feet. 2. Wolves living in the wild will be more brave and wild than people. 3. Psychologists selected 1 people and said that they were all very talented. Later, all 1 people succeeded, but what they didn't know was that psychologists thought they were just ordinary people.