【每日听力 • 真题系列】
When dogs looked at the expressions of angry dogs, their eyes rested more on the mouth, perhaps to 1 . And when looking at angry humans, they tended to 2 . Dogs may have learned to 3 from humans and 4 , according to researcher Sanni Somppi. Avoiding conflicts may have helped dogs 5 .
【出处:2017年6月四级听力第一套,篇章2】
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