are taken.Holes are bored into the soil and rock in order to measure the strength and wetness of the soil.Before putting anything on the old roads,the route has to be cleared and leveled.Builders normally use large bulldozers and scrapers to make the route clean and even.Afterwards,thick layers of concrete are put down.The concrete makes a good foundation to the surface,but it has to be put down layer by layer.A paver is used to spread the concrete evenly.Finally,the top surface is laid with tarmac. Now,the road building is finished.However,there is one more thing to do to protect the road users.Traffic guides are added to navigate the transportation and in some highways cat's eyes are put in to guide the drivers at night.After these installments,people can safely use the road. 说明：当总分出现0.5分时，在总分上加1分取整。 221are taken. Holes are bored into the soil and rock in order to measure the strength and wetness of the soil. Before putting anything on the old roads, the route has to be cleared and leveled. Builders normally use large bulldozers and scrapers to make the route clean and even. Afterwards, thick layers of concrete are put down. The concrete makes a good foundation to the surface , but it has to be put down layer by layer. A paver is used to spread the concrete evenly. Finally , the top surface is laid with tarmac. Now , the road building is finished. However, there is one more thing to do to protect the road users. Traffic guides are added to navigate the transportation and in some highways cat's eyes are put in to guide the drivers at night. After these installments, people can safely use the road. 说明 z当总分出现 5分时，在总分上加1分取整。 221