Directions: In this section, you will hear 3 short
passages. At the end of each passage, you will hear some 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 2 with a
single line through the centre.
What has long been a topic of discussion among economists
A．The merits and drawbacks of a large population. B．The disadvantages of a large population. C．The advantages of a small population. D．The rapidly growing world population.