2. 外语
  3. ____________ (保护濒危物种)is a great economic burden on the developing nations.

____________ (保护濒危物种)is a great economic burden on the developing nations.

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问题 ____________ (保护濒危物种)is a great economic burden on the developing nations.
选项
答案Preservation of endangered species/Protection of rare species/Protection of species in real danger
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大学英语四级

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