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IELTS 18 Academic · Test 2

Listening · Part 4

Mock mode: in the real test you hear the recording once.

Questions 31–40
Complete the notes below.
Write ONE WORD ONLY for each answer.
  1. 0:00 Part 4. You will hear part of a lecture by Professor Nina Hart on sleep in the animal kingdom. First, you have some time to look at questions 31 to 40.
  2. 0:21 Now listen carefully and answer questions 31 to 40.
  3. 0:26 Lecturer: Good afternoon. Today's lecture is about sleep in the animal kingdom.
  4. 0:31 Lecturer: Almost every animal studied so far shows some form of sleep.
  5. 0:35 Lecturer: Some dolphins sleep with one half of their brain at a time.
  6. 0:40 Lecturer: This allows them to keep swimming and breathe.
  7. 0:43 Lecturer: Giraffes may sleep for less than two hours a day.
  8. 0:46 Lecturer: Bats can sleep for up to twenty hours.
  9. 0:49 Lecturer: Some birds sleep while flying long distances.
  10. 0:53 Lecturer: Predators tend to sleep more deeply than prey.
  11. 0:56 Lecturer: Even tiny fruit flies need sleep to learn.
  12. 1:00 Lecturer: Scientists record sleep using small electrodes.
  13. 1:03 Lecturer: The lecturer concludes that sleep must have a vital purpose.
  14. 1:08 Lecturer: That's all for today. Next week, we'll look at some case studies in more detail.
  15. 1:13 That is the end of Part 4. You now have some time to check your answers to Part 4.
  16. 1:29 That is the end of the listening test.

Sleep in the animal kingdom

Background

  • Almost every animal studied so far shows some form of 31.
  • Some dolphins sleep with one half of their 32 at a time.
  • This allows them to keep 33 and breathe.
  • Giraffes may sleep for less than two 34 a day.

Key developments

  • Bats can sleep for up to twenty 35.
  • Some birds sleep while 36 long distances.
  • Predators tend to sleep more deeply than 37.
  • Even tiny fruit flies need sleep to 38.

Today and the future

  • Scientists record sleep using small 39.
  • The lecturer concludes that sleep must have a vital 40.
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