Concept:Safety measures are practices that prevent harm to people, equipment, or the environment.
Explanation:Option A: Maintaining a dust-free environment protects the computer from dust-related damage and reduces health risks, so it is a safety measure.
Option B: Eating and typing at the same time can cause spills, which may damage the computer.
Option C: Opening the computer while it is connected to power can cause electric shock.
Option D: Wearing hand gloves while typing is not a standard safety practice for computer use.
Therefore, the correct safety measure is keeping the environment dust-free.
Answer:A. Maintaining a dust-free environment