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单选题
Why do some frogs change the pitch of its calls?
A
To be different from others.
B
To attract a female frog.
C
To tend out messages.
D
To go against traffic noises.
参考答案
参考解析
解析：
由第三段“…further away from the traffic noise and this increases the distance over which it can be for heard,”得知青蛙改变音高是为了避免噪音干扰。
由第三段“…further away from the traffic noise and this increases the distance over which it can be for heard,”得知青蛙改变音高是为了避免噪音干扰。
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单选题Most tree frogs change colors from time to time to fit in with its environment.A
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changeC
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判断题The most powerful signal of stress is a change of pitch on the vowel.（）A
对B
错
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