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题目内容
（国家开放大学-开放英语4）
This rare bird has become __
选择一项：
a.
an endangered specie
b.
endangered species
c.
endangering species
d.
an endangered species
选择一项：
a.
an endangered specie
b.
endangered species
c.
endangering species
d.
an endangered species
参考答案
