单项选择题

The word Wunderkind probably means______.

A．box
B．young genius
C．puzzle
D．squeal
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单项选择题
Which of the following is TRUE of CF echoes
A．They enable the bat to determine the size of the target.
B．They help identify the range of widely spaced targets.
C．In some species, they enable the bat to judge whether it is closing in on its target.
D．In some species, they help the bat to tell the shape of the target.
单项选择题
According to the passage, the shape of the target is reported to the echolocating bat by changes in the ______.
A．echo spectrum of CF signals
B．echo spectrum of FM signals
C．direction and velocity of the FM echoes
D．frequencies of the FM or the CF signals
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