What did the researchers discover in northern Kenya？A．A human tooth.B．A human skull.C．Thre

What did the researchers find in the experiment？A．Human walking used more energy than bipe

Who______that first discovered America—the New Continent？A．wasB．it wasC．was itD．did

Woman: Since when did you read the Sunday Times？ Man: Since I discovered its big help-want

The researchers have discovered that the formation of habit can be A. predicted B. reg

What did the researchers find in their study of f

For what a purpose did the researchers use raw po