請依下文回答第 47 題至第 50 題：
Denali National Park
One of the most well-known parks in Alaska is Denali National Park. It is home to Mt. McKinley, the tallest
mountain in North America. The park is 47 in the middle of the state, north of Anchorage, and is included on most
Alaska cruise tour itineraries.
The 6 million acres that comprise the park are complete subarctic eco-system with 750 48 of flowering plants
and over 200 birds and mammals. The park is a popular destination for tourists looking to hike, camp and view wildlife,
and the grounds of the preserve also 49 a subject for research in the natural sciences. Bus tours run along the
90-mile Denali Park Road, which is closed 50 private vehicles after Mile 15. Walking and biking are thus great
ways to get to know the park. Visitors also enjoy rafting, hiking and flight-seeing. 【題組】50 (A) to (B) in (C) at (D) from
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