题目:4.Whichgrasslandsarewidelyintroducedinthisunit?
A、Hulunbuirgrassland.
B、BoththeHulunbuirandXilingolgrasslands.
标准答案:B
题目:4.Whichgrasslandsarewidelyintroducedinthisunit?
A、Hulunbuirgrassland.
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