【简答题】A.They were used to pr wild animals from attacking people. B.They were used to keep wild animals from rushing onto the road. C.They were used to pr people from driving into forests. D.They w...
【简答题】Many animals 31 (disappear) during the history of the earth. 32 (famous) of these animals were dinosaurs. They lived on the earth 33 (ten) of millions of years...