Not all life depends on energy from sunlight. Microbial life has been found in bedrock more than five kilometers below the surface of the earth, and bacteria have been found on the deep ocean floor feeding on hydrogen and other gases rising from the interior of the earth through vents in the ocean floor. The statements above, if true, best support which of the following as a conclusion? The correct answer is “a thorough survey of a planet’ surface is insufficient to establish beyond a doubt that the planet contains no life.” 这个答案倒是没什么，只是在我读题的时候，不知道文章的中心在哪儿，我觉得中心是在not all life depends on energy from sunlight,但是og的解释说：
Since the passage includes information about both microbes below earth’s surface and bacteria on the ocean floor, the conclusion must embrace both situations. The conclusion will not be a specific statement about either one or the other, but rather a general statement about both. 可是答案和他的解释有什么关系啊？
thx! | 
