我这题的答案是D,我认为D也是非常有道理的

来源: 2010-01-01 17:54:58 [旧帖] [给我悄悄话] 本文已被阅读:

也是跟fact有关阿,因为The straturn from which the samples came has below the surface of the Earth ever since the Earth came into existence.
不是也说明了这些microorganisms肯定是在地下挖来的不是表面的吗?
谢谢回答