单项选择题
Questions 7 and 8 are based on the following news. At the end of the news item, you will be given 20 seconds to answer the questions. Now listen to the news.
What is the main purpose of the study()
A.To reveal cultural differences and similarities.
B.To investigate ways of physical punishment.
C.To analyze child behaviour across countries.
D.To expose cases of child abuse and punishment.