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单选题
It can be learned that the polar bear _____.
A
was first considered by Siegel to be the iconic animal in 1998
B
was first proposed by Siegel to be the endangered species in 2004
C
was not qualified scientifically as the endangered species until 2005
D
was not officially under the government protection until 2008
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参考解析
解析：
第二段第八句说2005年Siegel申请将北极熊列为濒危物种名单，三年后美国内政部长宣布北极熊为“受威胁物种”。这算得上一个成功，但还不是完全意义上的成功，因为濒危物种比“受威胁物种”的等级更高。
第二段第八句说2005年Siegel申请将北极熊列为濒危物种名单，三年后美国内政部长宣布北极熊为“受威胁物种”。这算得上一个成功，但还不是完全意义上的成功，因为濒危物种比“受威胁物种”的等级更高。
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