Questions 19 to 21 are based on the passage you have just heard.

Directions:In this section, you will hear three passages. At the end of each passage, you will hear three or four questions. Both the passage and the questions will be spoken only once. After you hear a question, you must choose the best answer from the four choices marked A, B, C and D). Then mark the corresponding letter on Answer Sheet 1 with a single line through the centre.
    19.
  • A A The nature of relationships between dogs.
  • B The reason a great many people love dogs.
  • C Why dogs can be faithful friends of humans.
  • D How dogs feel about their bonds with humans.
    20.
  • A They have an unusual sense of responsibility.
  • B They can respond to humans' questions.
  • C They can fall in love just like humans.
  • D They behave like other animals in many ways.
    21.
  • A They have their own joys and sorrows.
  • B They experience true romantic love.
  • C They help humans in various ways.
  • D They stay with one partner for life.