Passage Two Questions 29 to 32 are based on the passage you have just heard.

A．It’s a problem not yet solved.
B．It’s a question difficult to answer.
C．It’s a matter that is hidden or secret.
D．It’s a legend handed down from the past.

A．They don’t get rid of loose arm.
B．They can damage arm muscles.
C．They aren’t acceptable to most people.
D．They can raise one’s blood pressure.