12.Though Alberta's Banff National Park is home to a large and healthy wildlife population,it also welcomes about 3.5million visitors every year.Besides,4.5million humans drive through without stopping,all passengers on the busy Trans-Canada Highway that cuts through the park.That's why roadkill(animals that have been killed by cars on the road) was a common sight on the world's longest national road.
Banff first put up wildlife fencing on each side of the highway.Then,since 1996,they've opened six wildlife overpasses and 38underpasses,which have allowed for more than 140,000wild life crossings.
Though these crossings are normally closed to all humans,as a tourists I was lucky to be allowed to see Banff's Red Earth Overpass with road ecologist(生态学家) Trevor Kinley.As a project manager with Parks Canada,he told me that so far,they have recorded 10,000safe animal crossings on this overpass alone.That's 10,000animals lives saved and a whole lot of roadkill prevented.
Labib Salama,an animal lover,worries that forcing so much wildlife into using just a few bridges and tunnels(passages under the ground) is putting some animals'lives into danger.They probably become easy meals for their natural enemies on either side.However,the truth is that there are no more killings around the crossings than there are anywhere else in the park.
Walking over the Red Earth Overpass,I was surprised how natural the area seemed.The noise disappeared,as did the road.The forest has filled in the area so that anyone crossing would really have no idea they were crossing a main highway along the way,I found the fresh tracks of black bears,grizzlies,wolves,elk,deer,and marten.Somehow,all these animal tracks made me so happy,knowing that they were passing safely under and over the longest road in Canada.
21.What was the problem facing Banff National Park?C
A.Some animals were in danger of dying out
B.Too many people went to visit the park.
C.Highway cars took many animals'lives.
D.Visitors were often hurt by wild animals.
22.Labib Salama worries that some animals mayC.
A.fall off the bridges
B.be killed by passing cars
C.be eaten by others easily
D.refuse to use the tunnels
23.How is the area around the Red Earth Overpass?A
A.Quiet
B.Dry
C.Dirty
D.Dangerous
24.What does the author think of the Wildlife crossings in Banff?D
A.They've made it easier for visitors to walk around.
B.They've destroyed the environment in the park.
C.It is a waste of money to build them.
D.It is a good way to protect animals.