IELTS 16, Academic, Authentic Practice Tests, 2021

IELTS 16, Academic, Authentic Practice Tests, 2021.

   This test consists of four parts, each with ten questions. The first two parts are concerned with social needs. The first part is a conversation between two speakers and the second part is a monologue. The final two parts are concerned with situations related to educational or training contexts. The third part is a conversation between up to four people and the fourth part is a monologue.




Why we need to protect polar bears.
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.

Contents.
Introduction.
Test 1.
Test 2.
Test 3.
Test 4.
Audioscripts.
Listening and Reading answer keys.
Sample Writing answers.
Sample answer sheets.
Acknowledgements.



Бесплатно скачать электронную книгу в удобном формате, смотреть и читать:
Скачать книгу IELTS 16, Academic, Authentic Practice Tests, 2021 - fileskachat.com, быстрое и бесплатное скачивание.

Скачать pdf
Ниже можно купить эту книгу по лучшей цене со скидкой с доставкой по всей России.Купить эту книгу


Скачать - pdf - Яндекс.Диск.




Теги: тесты по английскому языку :: английский язык