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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