Practice Question 4 in TOEFL Speaking Section - Test 16 with Sample Answer

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Xuất bản 15/08/2015
Practising on these TOEFL iBT speaking tests helps you score high in the TOEFL Speaking Section. Check guide to answering this type of question below. This video is in the series of NEW TOEFL iBT Preparation: SUBSCRIBE with us the get the latest TOEFL tests ! ----------------------------- THIS IS TRANSCRIPT OF THE TALK IN THE TEST Professor: So, there’s been some interesting news for those of you who dream of life on other planets. It turns out that Mars has a pretty high concentration of methane in its atmosphere. Now, usually when we think of life, we associate it with oxygen, right? But that’s because we’re kind of prejudiced. A whole host of creatures need no oxygen whatsoever. The reason that this is important is that it looks like Mars has very little geologic activity. Methane can be produced without life, but as far as we know, there are no active volcanoes on Mars. Plus, here’s another interesting point—methane only lasts about 300 years in the atmosphere. So that means the methane we’re seeing now is fairly new...and it’s being replenished somehow.
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