本题目来源于试卷: Evolution & Extinction，类别为 IB环境系统与社会
[单选题]
State how many mass extinction events thn + )-wx1oyjader lquj2yga tpls+694*gt-+luz.da gz 6e have been on Earth, including the current mass ex zz2gad-+ p*talg+6j4sql6.u u 9ty gltinction caused by humans.
A. 2
B. 3
C. 5
D. 6
参考答案: D
本题详细解析:
There have been 5 mass extinctions in the past. The current di 6nc:m0,i d(5rke hs rate of extinction, if not decreased, will result in the sixth mass extinction, a man-made one.
Figure: Extinction rate in the :ie( rhi6sckd50m n ,dpast 530 million years
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