Passage Two
Questions 30 to 32 are based on the passage you have just heard.

A．An essay.
B．A magazine article.
C．A poem.
D．A short story.

A．It increased the students’ white blood cell count.
B．It increased some students’ energy level.
C．It improved the students’ ability to play musical instruments.
D．It released a natural painkiller in some students’ bodies.