A do whatever they like for relaxation
B where you can play all kinds of ball games
C than the world famous Broadway
D enjoy the colorful night life of the city
E where the wealthy people would go shopping
F for what seems to be a very small sum today
Fifth Avenue is the place______.

A．Caffeine blocks production of the enzyme that stops melatonin production.
B．Caffeine interrupts the flow of the hormone that prevents people from sleeping.
C．Caffeine halves the body’s levels of sleep hormone.
D．Caffeine stays in the body for many hours.

A．as a drink
B．as a gift
C．as food
D．as a medicine