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

A．They need to make more efforts.
B．The others have done the greater part of it.
C．They’ll have more work to do tomorrow.
D．They’ve finished more than half of it.

A．Seasonal variations in nature.
B．How we can improve our intelligence.
C．How intelligence changes with the change of seasons.
D．Why summer is the best season for vacation.