What was Robert Spring’s profession during the years in Philadelphia

A．He doesn’t go on a diet recently.
B．He usually takes his weight to work.
C．He has put on much weight.
D．He eats chocolate time and again.

A．Research shows that most people are carrying a gene that allows the body to break down caffeine quickly.
B．Research shows that even some people have faster gene, they should limit the cups of coffee each day.
C．Drinking coffee will only do harm to people’s health.
D．People who have a slower gene should not drink coffee more than three cups a day.