单选题：What is this passage about?（　）

题目内容：

What is this passage about?（　） A．The protection of parks
B．The National Park Service
C．Challenges and opportunities
D．Recreational activities

参考答案：

答案解析：

根据短文回答题。Searching for Smiles1 Ask most people anywhere in th

根据短文回答题。Searching for Smiles1 Ask most people anywhere in the world what they wa

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