Question: A worker finds that a barrel rolls more easily across a metal truck bed than it does over some gravel, which means there is more resistance on (A) the gravel (B) the metal truck bed. Do not use A and B to answer the question but instead, choose between "metal truck bed" and "gravel".
metal truck bed

Question: As the bird flew further into the air, and away from the town, he became a (A) Speck of dust (B) a giant in the sky. Do not use A and B to answer the question but instead, choose between "Flying" and "Bird".
Flying

Question: Carol was rolling her ball on the bed. She noticed that the ball moved faster on the silk sheets than on the wool blanket. This is because silk has (A) more resistance (B) less resistance Do not use A and B to answer the question but instead, choose between "silk sheet" and "wool blanket".
wool blanket