单项选择题


· You will hear an interview with Ms Spencer about the change of telephone numbers in the city.
· For each question 23-30, mark one letter (A, B or C) for the correct answer.
· You will hear the interview twice.
Over the next 5 years, every phone number in the city will gain an extra

A. 8 digits.
B. 2 digits.
C. 1 or 2 digits.