单项选择题

Directions : This part is to test your ability to understand short dialogues. There are 5 recorded dialogues in it. After each dialogue, there is a recorded question Both the dialogues and the questions will be spoken only once. When you hear a question ,you should decide on the correct answer from the four choices marked,given in your test paper. Then you should mark the corresponding letter on the Answer Sheet with a single line through the center. Now the test will begin.

A. $16.
B. $12.
C. $20.
D. $24.