单项选择题

Questions 4 to 7 are based on the following conversation. At the end of the conversation, you will be given 20 seconds to answer the questions.
Now listen to the conversation.

What is the basic purpose of IQ tests

A.They are designed to measure children’s intelligence.
B.They are intended to test linguistic and numerical skills.
C.They are designed to test why some children perform better at school.
D.They are intended to find out why some children are not appreciated.