单选题
Which of the following is NOT among the four possibilities of why we haven' t been visited?
A、
Forms of life on the other planets don't evolve to intelligent beings.
B、
Earth is the only planet that contains life in the universe.
C、
Life on the other planets destroys itself
D、
Beings from outer space are too far away from us.
【正确答案】
D
【答案解析】
文章从第三段开始介绍了为什么没有外星来访的四种可能性，而选项D在文中并没有提到。
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