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单选题
According to Parris, what are the reasons for the dropping of the frog’s population in Melbourne?
A
Air conditioners and construction noise.
B
The urban noises and the lack of rainfall.
C
The change of the frequency of the mating call.
D
Fewer ponds.
参考答案
参考解析
解析：
第一段提到“Traffic noise and other sounds of city life, such as air conditioners and construction noise,”可知A项是各种噪音中的两种，因此A不全面。D项“池塘数量的减少是由于干旱”不是根本原因。C项“求偶叫声频率的改变是青蛙面对噪音干扰的反应”，不是其数量减少的原因。B项正确。
第一段提到“Traffic noise and other sounds of city life, such as air conditioners and construction noise,”可知A项是各种噪音中的两种，因此A不全面。D项“池塘数量的减少是由于干旱”不是根本原因。C项“求偶叫声频率的改变是青蛙面对噪音干扰的反应”，不是其数量减少的原因。B项正确。
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