[单选题] 提问人:匿名网友 提问时间:2021-08-22

Dr.Richmond conducted the experiment with the purpose of finding____.


A .when humans began walking on two legs.
B .what made our ancestors walk upright.
C .what benefits walking upright brought to our ancestors.
D .how walking upright helped chimpanzees monopolize resources.

提问人:匿名网友 提问时间:2021-08-22

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