People knew the nature of wolf very well. Once grey wolf could be found in many parts of the earth.

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问题 People knew the nature of wolf very well.
Once grey wolf could be found in many parts of the earth.

选项 A、Right.
B、Wrong.
C、Doesn’t say.

答案A

解析 从本文的第二、第三段可以知道这种灰色的狼是狼类中数量最多的一类,它广泛存在于北美、欧洲和亚洲等地,所以句中的说法是正确的。
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