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ID= 118

ID= 119

موضوع متن در مورد چیست؟با توجه به کی وردهای انتخاب شده در سوال و استراتژی حل سوال که در راهنمایی آمده است کی وردهای پرافریز شده در متن را پیدا کنید و به سوال جواب T , F , NG بدهید. Polar bears are being increasingly threatened by the effects of climate change, but their disappearance could have far-reaching consequences. They are uniquely adapted to the extreme conditions of the Arctic Circle, where temperatures can reach -40°C. One reason for this is that they have up to 11 centimetres of fat underneath their skin. Humans with comparative levels of adipose tissue would be considered obese and would be likely to suffer from diabetes and heart disease. Yet the polar bear experiences no such consequences. A 2014 study by Shi Ping Liu and colleagues sheds light on this mystery. They compared the genetic structure of polar bears with that of their closest relatives from a warmer climate, the brown bears. This allowed them to determine the genes that have allowed polar bears to survive in one of the toughest environments on Earth. Liu and his colleagues found the polar bears had a gene known as APOB, which reduces levels of low-density lipoproteins (LDLs) – a form of 'bad' cholesterol. In humans, mutations of this gene are associated with increased risk of heart disease. Polar bears may therefore be an important study model to understand heart disease in humans.


چرا باید از خرس‌های قطبی محافظت کنیم Why we need to protect polar bearsfat underneath their skin →fat under their skin , suffer→suffer , diabetes and heart disease→health problems One reason for this is that they have up to 11 centimetres of fat underneath their skin. Humans with comparative levels of adipose tissue would be considered obese and would be likely to suffer from diabetes and heart disease. Yet the polar bear experiences no such consequences. یکی از دلایل این سازگاری این است که آن‌ها تا ۱۱ سانتی‌متر چربی زیر پوست خود دارند. انسان‌ها با سطح مشابهی از بافت چربی چاق محسوب می‌شوند و احتمالاً به دیابت و بیماری قلبی مبتلا می‌شوند. اما خرس قطبی هیچ‌یک از این مشکلات را تجربه نمی‌کند. با توجه به معنی متن اما خرس قطبی هیچ‌یک از این مشکلات را تجربه نمی‌کند پس جواب سوال F است. 1- Polar bears suffer from various health problems due to the build-up of fat under their skin. خرس‌های قطبی به دلیل تجمع چربی زیر پوست خود دچار مشکلات مختلف سلامتی می‌شوند.