单项选择题
Questions 11 to 13 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions. Now, listen to the passage.
We learn from the passage that()
A.people are very keen on sales
B.post-Christmas sales start at 3:30 am
C.post-Christmas sales last for a day
D.sales include only a few items