(单选题)
What can be learned from Dr. Kaminski?
A.Dogs are able to change and improve their facial expressions.
B.Dogs make more facial expressions when humans are present.
C.Dogs stole food more often when humans were paying attention.
D.Dog may not satisfy human’s needs as it seems.
参考答案：B
参考解析：
推理判断题。从第六段“The findings appear to support evidence dogs are sensitive to humans’ attention and that expressions are potentially active attempts to communicate, not simple emotional displays.”和第七段最后一句“Dr. Kaminski said it is possible that dogs’ expressions have evolved as they were domesticated.”可看出，Dr Kaminski的研究结果打破了第二段中人们长久的认知，狗在家养的过程中，面部表情也在进化，变成了一种交流的方式（博关注）。故选B。
知识点：
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