Questions 1 to 5 are based on a conversation. At the end of the conversation you will be given 10 seconds to answer each of the following five questions. Now listen to the conversation. This passage is mainly about ______.

A．how some mothers on the farm worry about the children’s education
B．how some children help their mother to do the chores on a farm
C．how some thin children are forced to work in the field
D．how Gugu and Zandi make a visit to their friend’s family