2. 外语
  3. A、The protection of national parks. B、The history of national parks. C、The service of national parks. D、The pollution of nationa

A、The protection of national parks. B、The history of national parks. C、The service of national parks. D、The pollution of nationa

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问题
选项 A、The protection of national parks.
B、The history of national parks.
C、The service of national parks.
D、The pollution of national parks.
答案B
解析
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大学英语六级

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