单选题 By comparison, the author considers that ______.

A、 a more advanced civilization will destroy us if they visit us at present
B、 the original inhabitants of America were better off because of Columbus' visit
C、 being visited by a more advanced civilization will do us good
D、 we wouldn' t be better off even though we were visited by the beings from outer space at present

【正确答案】 A

【答案解析】文章最后一句话的意思是：在现阶段遭遇外星人可能会有点像美洲人遭遇哥伦布，我认为哥伦布的到来并没有给美洲居民带来好结果。言外之意就是这时候遭遇外星人可能会给我们带来灾难。所以选A。