Bên cạnh Phân tích+Sửa bài"The chart shows British Emigration to selected destinations between 2004 and 2007" IELTS WRITING TASK 1 (bar graph), IELTS TUTOR cũng cung cấp luyện đề: Bird Migration Theory IELTS LISTENING SECTION 4.
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II. Đề bài & Audio Luyện đề: Bird Migration Theory IELTS LISTENING SECTION 4
Questions 31 – 40
Complete the notes below. Write ONE WORD ONLY for each answer.
Bird Migration Theory
Most birds are believed to migrate seasonally.
Hibernation theory
- It was believed that birds hibernated underwater or buried themselves in 31 …………………… .
- This theory was later disproved by experiments on caged birds.
Transmutation theory
- Aristotle believed birds changed from one species into another in summer and winter.
- - In autumn he observed that redstarts experience the loss of 32 ………… and thought they then turned into robins.
- - Aristotle’s assumptions were logical because the two species of birds had a similar 33 …………………… .
17th century
- Charles Morton popularised the idea that birds fly to the 34 …………………… in winter.
Scientific developments
- In 1822, a stork was killed in Germany which had an African spear in its 35 …………………… .
- – previously there had been no 36 …………………… that storks migrate to Africa
- Little was known about the 37 …………………… and journeys of migrating birds until the practice of ringing was established.
- – It was thought large birds carried small birds on some journeys because they were considered incapable of travelling across huge 38 …………………… .
- – Ringing depended on what is called the 39 ‘……………………’ of dead birds.
- In 1931, the first 40 …………………… to show the migration of European birds was printed.
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