GRE Reading Comprehension
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Source: NO8
Echolocating bats emit sounds in patterns—characteristic of each species—that contain both frequency-modulated (FM) and constant-frequency (CF) signals. The broadband FM signals and the narrowband CF signals travel out to a target, reflect from its, and return to the hunting bat. In this process of transmission and reflection, the sounds are changed, and the changes in the echoes enable the bat to perceive features of the target.
The FM signals report information about target characteristics that modify the timing and the fine frequency structure, or spectrum, of echoes—for example, the target's size, shape, texture, surface structure, and direction in space. Because of their narrow bandwidth, CF signals portray only the target's presence and, in the case of some bat species, its motion relative to the bat's. Responding to changes in the CF echo's frequency, bats of some species correct in flight for the direction and velocity of their moving prey.
Which of the following best describes the organization of the passage?
- A A fact is stated, a process is outlined, and specific details of the process are described.
- B A fact is stated, and examples suggesting that a distinction needs correction are considered.
- C A fact is stated, a theory is presented to explain that fact, and additional facts are introduced to validate the theory.
- D A fact is stated, and two theories are compared in light of their explanations of this fact.
- E A fact is stated, a process is described, and examples of still another process are illustrated in detail.