Digital SAT Practice Test: Text Structure & Purpose (Set 3)
This adaptive-style simulation simulates the real Digital SAT exam interface to help you master Text Structure & Purpose.
Set 3: Text Structure
1 / 10PASSAGEScience
Penguins are birds, but they cannot fly. Instead, they use their wings as flippers. This allows them to swim very fast underwater to catch fish.
1
Which choice best describes the function of the underlined sentence?