单项选择题

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. Passage One
Passage One
Questions 26 to 28 are based on the passage you have just heard.

A. 15%.
B. 25%.
C. 30%.
D. 35%.