单选题
Fanning emerged as a survival strategy because man had been obliged______.
A、
to give up his former way of life
B、
to leave the coastal areas
C、
to follow the ever-shifting vegetation
D、
to abandon his original settlement
【正确答案】
A
【答案解析】
事实细节题，根据文章第一段最后两句的内容：由于沙漠扩大，世界各洲植被变化，许多动物濒临灭绝，所以人类被迫放弃旧的靠狩猎为生的生活方式，而转为发展耕种业。由此可见，选项A是正确答案。
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