每周一聽——那些年我們一起練過的聽力（第175期）

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獎項——聽寫后正確填空者可得BB獎勵
評分規(guī)則：
每篇設(shè)空十處，每答對一空獎勵一個BB，全對的蟲子可得15個BB獎勵。有好的建議大家可以跟帖留言，加油哦~~~~~~

Radio waves are    (1)    to our eyes. But if you could see them, the sky would dance with random tiny flashes. Thousands of what are called “fast radio bursts” are estimated to occur every day. And though each pinprick flash lasts only a    (2)    of a second, they represent a faraway source briefly shining a billion or more times brighter than our sun.
Fast radio bursts have been known for nearly a decade, but scientists have    (3)    to determine exactly where they come from. And they’d like to know. Because finding their origins would help astronomers use the bursts as    (4)    to map the history and structure of the universe in    (5)    detail.
Now researchers have found the source of one particular burst. They used radio telescopes in Australia and the giant Subaru optical telescope in Hawaii to trace a burst observed last April. And they determined it came from an old elliptical galaxy full of exhausted, dying suns some six billion light-years away. The findings are in the journal Nature. [Link to come]
   (6)    the source galaxy provides crucial clues. For one thing, such a galaxy is short on some of the objects expected to cause bursts, such as supernovae or rapidly spinning and flaring pulsars, suggesting this burst came from something else. And, although the burst in question lasted only milliseconds, astronomers were able to    (7)    its faint, fading radio afterglow for about six days. That’s the sort of afterglow expected from a colliding pair of ancient neutron stars, which would be a relatively common occurrence among an elliptical galaxy’s geriatric suns.
Even though this particular burst has probably been explained, many mysteries remain—not all bursts seem to come from the same cosmic source.    (8)    , most possible burst sources could be    (9)    by the gravitational waves they emit, like those recently seen by the Laser Interferometer Gravitational-Wave Observatory, or LIGO. That means researchers may soon be searching the skies for both radio and    (10)    waves for these bursts, to help draw an ever more detailed map of the cosmos.
小伙伴們，開學(xué)啦，新的學(xué)期， 我們要打起精神好好學(xué)習(xí)，好好工作，堅持學(xué)英語，堅持每周一聽，讓我們一起進(jìn)步， 語言的學(xué)習(xí)貴在積累，堅持，小伙伴們?nèi)绻�每周都堅持這個活動，一段時間后，你們會發(fā)覺自己聽力及英語水平的提高，所以大家和我一起努力學(xué)習(xí)，共同進(jìn)步，讓英語成為我們的愛好，接下來的活動我會出一些新的鼓勵政策，具體政策還在籌劃，主要目的當(dāng)然是鼓勵小伙伴們堅持學(xué)英語。新的學(xué)期，讓我們共有努力，一起加油，共同進(jìn)步！��！
上期答案
1.responsible
2.unfairly
3.trapped
4.contributions
5.versus
6.incurring
7.extreme
8.addressing
9. mobilization
10. vulnerable