gre阅读练习每日一篇(三十九)_GRE阅读

gre阅读练习每日一篇(三十九)

　　24. According to the passage, the information provided to the bat by CF echoes differs from that provided by FM echoes in which of the following ways?

　　Only CF echoes alert the bat to moving targets.

　　Only CF echoes identify the range of widely spaced targets.

　　Only CF echoes report the targets presence to the bat.

　　In some species, CF echoes enable the bat to judge whether it is closing in on its target.

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

　　25. 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

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

　　argumentative

　　commendatory

　　critical

　　disbelieving

　　objective

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

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