Question

1. the surface is irregular.

a uneven
b rectangular
c messy
d smooth
e unclean

Explanation:

To solve this, we analyze the meaning of "irregular" in the context of a surface. "Irregular" here means not regular or even.

• Option A: "uneven" means not level or smooth, matching "irregular" for a surface.
• Option B: "rectangular" refers to a shape, not the regularity of a surface.
• Option C: "messy" implies disorderly, not about the surface's regularity.
• Option D: "smooth" is the opposite of irregular/uneven.
• Option E: "unclean" means dirty, not related to the surface's regularity.

So the correct option is A as "uneven" is a synonym for "irregular" in describing a surface.

Answer:

A. uneven