W: Are you still teaching at the junior high school
M: Not since June. My brother and I opened a restaurant as soon as he got out of the army.
Q: What do we learn about the man from the conversation().

A. He quit teaching in June.

B. He has left the army recently.

C. He opened a restaurant near the school.

D. He has taken over his brother’s business.

典型的市场测试目标有（）、决定产品购买者的特征、决定购买频率和目的、决定在哪儿购买、测量新产品的销售对产品线上现有相似产品销售的影响。