Answer C

Answer analysis test question analysis: The main component of "gutter oil" is lipid, and lipids are divided into fats, lipids and sterols; the elemental composition of fat is only Containing C, H, O, the phospholipid elements in lipids are composed of C, H, O, N and P, A is incorrect; sugar is the main energy substance in the body, B is incorrect; fat appears orange when exposed to Sudan III dye , C is correct; glycoprotein does not contain lipids, D is incorrect.

Test points: This question tests knowledge about lipids and is intended to test candidates’ ability to understand the key points of the knowledge they have learned, grasp the intrinsic connections between knowledge, and form a knowledge network structure.