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听力原文：Good morning, ladies and gentlemen! Here we are, the Great Smoky Mountains National Park. This park is one of the largest protected areas in the Eastern United States, which attracts over nine million visitors each year. In the following hours, we'll see a great variety of plants and animals, beautiful ancient mountains, and the valuable relics of the Southern Appalachian mountain culture. Ok, let's begin our adventure from the waterfalls on the right! If you are a fan of waterfalls, this park has abundant waterfalls to keep you happy. This one here is Grotto Falls… What is the speaker doing?A.
She is giving a lesson on the landscape of Eastern United States.
B.
She is spreading environmental protection information to tourists.
C.
She is evaluating the quality of water in the Great Smoky Mountains.
D.
She is guiding a group of tourists for a visit.
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