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【单选题】

剑齿虎灭绝于大约()前。

A.
20万年
B.
30万年
题目标签:灭绝
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参考答案:
参考解析:
.
刷刷题刷刷变学霸
举一反三

【单选题】旅鸽灭绝的原因是( )。

A.
欧洲殖民者食用旅鸽
B.
人类大量捕杀旅鸽
C.
旅鸽失去栖息地
D.
利用媒鸽引诱其他旅鸽

【单选题】Many people feel that human beings are responsible for the disappearance of some other animal species. While we may have hastened the disappearance of some, abundant evidence suggests mankind has had ...

A.
Human beings have hastened the disappearance of some.
B.
There was mass extinction long before humanity's time on Earth.
C.
Human beings'activities have had great impact on the earth.
D.
Many species have extinct since the human race came into being.