题目选项分析

According to scientists, human expansion and human appropriation of Earth's finite resources are the cause of what may be the most sweeping wave of species extinctions since the demise of the dinosaurs 65 million years ago.

According to scientists, human expansion and the human appropriation of Earth's finite resources is the cause of what may be the most sweeping wave of species extinctions since the demise of the dinosaurs 65 million years ago.