未知题型

A.地球所拥有的适合居住的表面区域太小,抵御毁灭性灾难的能力差
B.突如其来的全球变暖、核战争、基因病毒或其他危险威胁人类
C.如果人类不能及时移民至其他星球,难免会被某一灾难消灭
【参考答案】

A
解析:作者通过引述霍金的话表达了这样的观点:地球生命被某一灾难消灭的可能性正在与日俱增,抵御毁灭性灾难能力差...

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