GRE阅读高频机经原文及试题：蝙蝠的回声定位_GRE阅读

　　In some species, CF echoes enable the bat to discriminate the size of its target and the direction in which the target is moving.

　　33.2. According to the passage, the configuration of the target is reported to the echolocating bat by changes in the

　　echo spectrum of CF signals

　　echo spectrum of FM signals

　　direction and velocity of the FM echoes

　　delay between transmission and reflection of the CF signals

　　relative frequencies of the FM and the CF echoes

　　33.3. The author presents the information concerning bat sonar in a manner that could be best described as

　　argumentative

　　commendatory

　　critical

　　disbelieving

　　objective

　　33.4. Which of the following best describes the organization of the passage?

　　A fact is stated, a process is outlined, and specific details of the process are described.

　　A fact is stated, and examples suggesting that a distinction needs correction are considered.

　　A fact is stated, a theory is presented to explain that fact, and additional facts are introduced to validate the theory.

　　A fact is stated, and two theories are compared in light of their explanations of this fact.

　　A fact is stated, a process is described, and examples of still another process are illustrated in detail.

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