Free SAT Practice Question

Question 1 of 1
ID: SAT-RW-CS-023
Section: SAT Reading & Writing (RW) – Craft and Structure
Topic: Text Structure and Purpose
Difficulty level: Medium

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The following text is adapted from a naturalist's essay.

On certain summer nights the shallow bay glows a faint blue wherever the water is stirred — a boat's wake, a dipped oar, a wading heron. The light comes from countless single-celled organisms that flash when they are jostled. For years I assumed the glow was something rare, a sight you had to travel far to catch. In truth it returns to the same ordinary coves summer after summer; what is rare is being out late enough, and still enough, to notice it.

Which choice best describes the function of the underlined sentence in the text as a whole?

AIt lists the specific places a person must travel to in order to see the glow.

BIt offers evidence for the earlier claim that the glow appears only where the water is stirred.

CIt shifts the essay's focus from the glowing bay to the writer's history as a traveler.

DIt states a belief the writer once held, which the final sentence then corrects.

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