Humans have been damaging the environment for centuries by overcutting trees and farming too intensively, and though some protective measures, like the establishment of national forests and wildlife sanctuaries, having been taken decades ago, great increases in population and in the intensity of industrialization are causing a worldwide ecological crisis.
-
Athough some protective measures, like the establishment of national forests and wildlife sanctuaries, having been taken decades ago, great increases in population
分析该选项
-
Bthough some protective measures, such as the establishment of national forests and wildlife sanctuaries, were taken decades ago, great increases in population
分析该选项
-
Cthough some protective measures, such as establishing national forests and wildlife sanctuaries having been taken decades ago, great population increases
分析该选项
-
Dwith some protective measures, like establishing national forests and wildlife sanctuaries that were taken decades ago, great increases in population
分析该选项
-
Ewith some protective measures, such as the establishment of national forests and wildlife sanctuaries, having been taken decades ago, great population increases
分析该选项
显示答案
正确答案: B