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单选题
Female frogs may not be attracted by the new call because _____.
A
it is strange and unusual
B
they are used to the old call
C
the male frogs don’t know how to attract them
D
lower frequency has special physical meaning
参考答案
参考解析
解析：
由倒数第二段“When females have a choice between two males calling, …So, the bigger frogs tend to call lower,”可知体型大的青蛙叫声更低，更能吸引异性。D项指出低频率叫声有着特殊的物理意义，即青蛙的体型差异。所以D项真确。
由倒数第二段“When females have a choice between two males calling, …So, the bigger frogs tend to call lower,”可知体型大的青蛙叫声更低，更能吸引异性。D项指出低频率叫声有着特殊的物理意义，即青蛙的体型差异。所以D项真确。
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