Multiple choice

Directions: Give one word substitution for the following phrase/sentence:

A large wheel turned by the weight of people or animals walking on steps around its inside edge, and used to operate machinery

  1. Windmill

  2. Crosser

  3. Treader

  4. Treadmill

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A treadmill is a device that was historically used to power machinery by having people or animals walk on steps inside a large wheel.