1. **Is the object a long cylinder?**
   - **Answer:** Yes
   - **Reasoning:** All three images show an object with a cylindrical shape that is elongated, consistent with the characteristics of a long cylinder.

2. **Is the cylinder hollow?**
   - **Answer:** Yes
   - **Reasoning:** The images reveal that one end of the cylinder is open, showing an empty space inside, which indicates that the cylinder is hollow.

3. **Has the cylinder been extruded?**
   - **Answer:** Unclear
   - **Reasoning:** The images show a cylindrical shape, but without specific information on the manufacturing process or additional context, it is unclear whether the cylinder has been extruded or formed through another process.

4. **Is there a semi-circular cut in the middle of the cylinder?**
   - **Answer:** No
   - **Reasoning:** None of the images show any visible cuts or alterations in the middle section of the cylinder; it appears to be a continuous, unaltered surface throughout its length.