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[originaltext]W: Today’s guest on "Science Update" is David Brown. Dr. Brown, y
[originaltext]W: Today’s guest on "Science Update" is David Brown. Dr. Brown, y
游客
2024-02-19
16
管理
问题
W: Today’s guest on "Science Update" is David Brown. Dr. Brown, you and your team have found bacteria far below the Earth’s surface. You must be thrilled about your discovery.
M: Well, yes, it’s very exciting. For a long time we’d suspected the presence of such organisms, but we lacked substantial evidence.
W: How did you confirm the existence of the bacteria?
M: Well, technology helped. Our drilling techniques have improved significantly, and so the risk that surface bacteria could be mistaken for those found at much greater depth was reduced. With the new techniques, we could get much deeper into the Earth.
W: How far down did you actually get?
M: In one case, about three kilometers. We were surprised, I must tell you, that there were organisms that far down.
W: You know, it sounds like fiction, something like a lost world.
M: Let’s call it a hidden biosphere, and it’s probably a very extensive one. The mass of the living organisms below the surface may be equal in size to the mass of the surface bacteria.
W: Have you found any unique life-forms?
M: Yes. One of the organisms is the first anaerobic bacillus ever discovered. That means it can live and grow only where there is no oxygen.
W: Is there any danger of these bacteria infecting people when you bring them to the surface?
M: The bacteria in question were adapted to an environment that’s hostile and alien to humans. Conversely, there anaerobic bacteria could not survive in our environment. So we really don’t need to worry about these bacteria causing illness in people.
选项
A、The bacteria would be killed by the human immune system.
B、The bacteria would die if brought to the surface.
C、Many antidotes and remedies are available.
D、Drilling operations are always closely monitored.
答案
B
解析
“anaerobicbacillus”是指“厌氧性细菌”,这是一个生僻词组,考生不知道的可能性很大。但M随后又对它进行了解释,指出这种细菌只能生存在没有氧气的地方,可见,它不可能给人类造成任何感染,因为它不能与人类共存在一下环境里,与之意思相近的只有选项B。
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