(单选题)
What is most likely to work on dogs’ communicative ability during their evolution?
A.Dog cognition
B.Mood swings
C.Human’s affection
D.Selection pressures
参考答案：D
参考解析：
细节理解题。该题可定位到最后一段最后一句“They have lived alongside humans for 30,000 years and during that time selection pressures seem to have acted on dogs’ ability to communicate with us, she said.”，从该句可知，狗和人类一起居住了三万年，在这段时间里，选择压力似乎影响了狗与我们交流的能力。A项意为“狗的认知”；B项意为“情绪波动”；C项意为“人的情感”；D项意为“选择压力”。故选D。
知识点：
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