单词:tetraspans
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Finn: Hello and welcome to 6 Minute English from BBC Learning English. Im Finn and with me is Rob. Hi Rob. Rob: Hi Finn. Finn: Rob, I have a question for you. Are you good at reading maps? Rob: I have to say, I am, I really enjoy reading maps and I u
[00:02.74]Risks [00:04.97]Part Two [00:07.24]Listening-Centered Activities [00:10.66]Listening I [00:13.90]Exercise 1 [00:17.53]Directions: [00:20.27]Listen to the passage and answer the following Yes/Not questions. [00:27.40]The possibility that som
This is Scientific American Sixty Seconds Science, I'm Sophie Bushwick, got a minute? When Mexican tetra fish moved into darker caves long ago, they evolved to deal with the dark by becoming albino and going blind. A new research shows that the chang
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10 Getting The Lead Out 第十章 把铅撵出去 In the late 1940s, a graduate student at the University of Chicago named Clair Patterson (who was, first name notwithstanding, an Iowa farm boy by origin) was using a new method of lead isotope measur