每周一聽——那些年我們一起練過的聽力（第192期）

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每周一聽——那些年我們一起練過的聽力（第192期）

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The first life on Earth appeared about four billion years ago. One place these    (1)    organisms may have emerged is at hydrothermal vents, deep underwater. Where unusual chemistry provided energy for   (2)    life-forms to survive. Life-forms like the methane-belching microbes found at the vents today.
Now, for the first time, researchers have found evidence of methane-producing life in similarly extreme conditions, but at the surface of the Earth — at a spring in northern California, called The Cedars. The water there is extremely basic — with a pH of 11.6. And it contains no oxygen. Not an easy place to survive.
Researchers tested water and    (3)    at the Cedars. Some samples got dosed with mercuric chloride to kill any life present. Those dosed samples produced no    (4)    . But the samples in which microbes were allowed to survive did put out methane. Confirming that at least some of the methane at the springs is indeed   (5)    in origin. The findings appear in the Journal of Geophysical Research: Biogeosciences.

The finding has implications for climate change    (6)    . A geologically similar spring in Oman has been proposed as a site for carbon storage—pumping CO2 underground, where it gets    (7)    in stone. But the    (8)    at The Cedars can use CO2 to make methane—an even more potent greenhouse gas. "So imagine pumping CO2 into the ground and having it come back up as methane." Penny Morrill, a biogeochemist at Memorial University of Newfoundland. "This will not necessarily happen, but it is something to be tested for before fully    (9)    a carbon capture and storage technology at one of these types of sites."
Morrill says the study's also a reminder that life is   (10)  ."We should not let our biases prevent us from looking for evidence of life in what we would otherwise consider an unexpected place." Including other planets and moons.
最近畢業(yè)季，各種事情場合比較多，忙的焦頭爛額�，F(xiàn)在還沒有給大家評分，依舊和大家說聲：對不起！對不起！對不起！我會盡快完成評分�！癝tudying has almost no short term rewards. But the long term rewards are huge!”讓我們一起學英語，我們一起聽聽力！每天進步一點點！ 期待更多小伙伴加入我們。加油�。。〗饚弄剟罨顒永^續(xù)，連續(xù)參加4期的小伙伴們請私信我，我會給大家及時發(fā)放獎勵，期待你們?nèi)〉酶�大的進步和更多的獎勵！
上期答案
1. predatory
2. mutualism
3. cross-protective
4. resistant
5. succumbing
6. coexistence
7. donates
8. individually
9. guidance
10. circumstances

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