Read this introduction to a magazine article.Your hands are up, your eyes are squeezed tight, your mouth is poised to unleash a scream . . . you are on a roller coaster. But are you recalling science-class lessons about gravity and inertia? Are you contemplating the gears and mechanisms providing this thrill? It is unlikely that academics are on your mind, but lessons are lurking behind every ride.
Answer
A
a description of the history of roller coasters
B
criticisms about roller-coaster safety
C
testimony from roller-coaster enthusiasts
D
an explanation of the physics of roller coasters
Explanation
The introduction mentions gravity, inertia, gears, and mechanisms—all scientific ideas involved in how a roller coaster works. The final sentence says that lessons are “lurking behind every ride,” suggesting the article will explain the science of roller coasters. So the best choice is D, an explanation of the physics of roller coasters.
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