1.How often does the man make physics experiments?
A.Once a month. B.Twice a week. C.Once a week.
2.Which seasons in Beijing does the woman like?
A.Spring and summer. B.Summer and autumn. C.Autumn and winter.
3.Why do the speakers want to take the underground?
A.Because it's faster. B.Because it's cheaper. C.Because it's cleaner.
