2016年职称英语理工A类补全短文真题及答案解析‍
第
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Researchers Discover Why
Humans Began Walking Upright
Most of us walk and carry items in our hands every day. These are seemingly simple activities that the majority of us don'
t question.
46 ________
.
The team of researchers from the U.S, England, Japan and Portugal investigated the behavior of modern-day chimpanzees as they competed for food resources
，
in an effort to understan