B

　　(2016·广西高考名校联考信息优化卷四)Alaska is home to 23 national parks，which make up two-thirds of the United States’ 83 million acres of national parkland.In 2010，those parks attracted more than 2.2 million visitors.But since conditions are everchanging at the parks，here’s a quick round-up of what to keep in mind before visiting.

　　Denali Park road closure－This autumn，Denali Park Road will be closed at Mile 3，from 1 October to 23 November，due to a road maintenance project.Hikers and bikers should be aware of heavy machinery usage during this time.

　　Denali mudslides－In Denali National Park and Reserve，the ice-rich permafrost(永冻土层)is thawing，leaving behind a mud slurry that can’t support the weight of soil and vegetation.One consequence is the threat of mudslides.Check conditions at Denali’s homepage before visiting.

　　Fee increase for Denali (Mount McKinley)—Starting 1 January，it will be more expensive to climb Mount McKinley，the highest mountain in North America.Climbers for ages 16 and up face fees of $350 per person，and climbers ages 15 and under will have to pay $250 per person.Fees for both groups are currently $200.

　　Bear activity—In Glacier Bay National Park，there have been recent black bear sightings reported near Bartlett River.There have also been bear sightings in Wrangell-St Elias，near the Nugget Creek public use cabin and the Amphitheater Creek area near Nizina River.The Alaska Department of National Resources offers several bear safety tips to help travellers prepare for any outdoor trip through Alaska’s parks.

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