I have displayed the image, allowing me to see the geometric figure. To answer your question:

For part 2, identifying the segment parallel to $CD$:

• In this geometric figure, $CD$ is one of the edges of the pyramid-like structure at the top.
• The corresponding segment parallel to $CD$ would be the opposite edge on the rectangular base.

Thus, segment $AB$ is parallel to $CD$.

Do you need further clarification, or would you like me to expand on the reasoning behind this?

Here are five related questions to deepen your understanding:

1. Why is $AB$ parallel to $CD$ in this figure?
2. What are skew lines, and how do they differ from parallel lines?
3. Which plane is perpendicular to both planes $BCD$ and $AEF$?
4. How can you determine if two planes are parallel?
5. How do you find skew lines in three-dimensional geometry?

Tip: Parallel lines in 3D geometry exist in the same plane, while skew lines do not lie in the same plane and never intersect.