Taken together,the findings provide support for the hypothesis that anatomical(解剖学的)differences affecting gait existed among our earliest apelike ancestors,and that these differences provided the genetic variation which natural selection could act on when changes in the environment gave bipeds an advantage over quadrupeds。
Fossil and molecular evidence suggests the earliest ancestors of the human family lived in forested areas in equatorial Africa in the late Miocene era(中世纪)some 8 to 10 million year ago. when changes in climate may have increased the distance between food patches. That would have forced our earliest ancestors to travel longer distances on the ground and favored those who could. cover more ground using less energy.
This isnt the complete answer. Sockol said. But its a good piece of a puzzle humans have always wondered about:How and why did we become human? And why do we alone walk on two legs?
41 Michael Sockol and his team were interested in
A where humans came from.
B how chimpanzees could be trained to use treadmills.
C why our apelike ancestors came to walk on two legs.
D when our earliest ancestors began to live In forested areas.
42 The phrase worked out in paragraph 3 could be replaced by
A exercised.
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