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.
To stay mentally active, which is not advocated

A.To read the newspaper.
B.To balance one’s checkbook with a calculator.
C.To visit the public library.
D.To do crossword puzzles.