赞题库-背景图
单项选择题

Directions. In this section, you will hear 8 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.
Passage One
Questions 16 to 19 are based on the passage you have just heard.

A. 15%.
B. 20%.
C. 30%.
D. 50%.