[originaltext]W: Today’s guest on "Science Update" is David Brown. Dr. Brown, y

游客2024-04-12  13

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. We’ve found a very special organism. Let’s call it Type-A bacterium. 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: These bacteria were adapted to an environment that’s completely different from humans’. That’s to say, they could not survive in our environment. So we really don’t need to worry about these bacteria causing illness in people.
1. What have Dr. Brown and his team discovered?
2. What helps to confirm the existence of bacteria below the Earth’s surface?
3. How deep down did the man find the bacteria?
4. Why does the man say there is no danger of infection by the bacteria brought to surface?

选项 A、They would be killed by the human immune system.
B、They would die once brought to the surface.
C、Many precautions and remedies are available.
D、Drilling operations are always closely monitored.

答案 B

解析 在最后一个话轮中,布朗博士提到,这些地底下的细菌在元氧的环境下生存,在我们有氧的环境中便无法存活,所以不用担心它们会传染疾病给人类,选项B为原文的同义替换。符合“长对话结尾常出题”的命题规律。A、C选项毫无原文依据,D利用了原文中的drilling进行干扰。
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