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【每日听力 • 真题系列】
2.93 听写填空训练---DAY47

★听写填空训练---DAY47      

【每日听力 • 真题系列】

Dogs, man's best friends,   1   dealing with angry owners – they look away. New research shows that dogs   2  . The scientists suggest this may be   3  . This behavior may have   4   as dogs gradually learned they could benefit from   5   humans.

出处:20176月四级听力第套,篇章2

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