在PTE中,无论是Summarise Spoken Text 还是 Re-tell Lecture的考题大都是从真实的讲座或者演讲中截取的,中间经常经常夹杂很多不同的环境音.很多同学都反映有时未必是听不懂,而是听不到. 鉴于此,墨尔本文波雅思PTE专门为大家总结了真实讲座的PTE练习音频,相比新闻音频来说,整体更加接近PTE考试的真题,内容方面,我们也会为大家提供考试中存在的近似题,最近我们会持续更新,敬请期待!
Plant stem cells actually matter and the final product of it actually matters a lot and so this became a little bit famous or infamous about 10 years ago where it was argued that stomata are the most influential cell type on the planet and you know you might argue that human brain cells are fairly influential cell type but you know we can’t live without these(stomata), and plants probably can’t live without brain cells so this is probably one of the most influential cells on the planet because of its function, because of this function and taking any carbon dioxide and releasing water vapor and so this was so not to be outdone 10 years ago, now it is not only arguably the most influential cell on the planet, but at the center of the crisis in water availability in crop production, we expect to see over the next few decades.
Right, so just a reminder of why we care about these, so this is that portal from which carbon dioxide enters from the atmosphere into the plant gets fixed in the sugars we eat that water vapor Oxygen come out so plants absolutely are dependent on this it helps them get the carbon dioxide, it also helps them bring water so the plants could have a vascular system they can’t pump things around, they actually have to go back to transfer it. Water in the soil comes up to the plant invited by evaporating at the top that brings the water up. It also helps to keep the plant cool like sweating.
Ok, so you’re gonna watch this loop a couple of times, I’ll explain what it is in a moment but that’s one stomata does, so it’s really important for that one plant, but if you start to think about all of this stomata, there’s millions of stomata on each plant and there are millions of plants and there are millions of acres, you start to think about the activities of all of those stomata. They are actually driving our climate cycles so if you think about the, imagine the entire water content of the atmosphere that’s been recycled through stomata twice a year. Thirty percent of the carbon that is in the atmosphere is coming in through stomata. So they have a massive effect on the climate and so this thing that you’ve been watching and yellow is actually CO2 and in green is vegetation and …
