A．Because drinking coffee wouldn't cure cancer.
B．Because people couldn't benefit from drinking decaf.
C．Because not everyone reacts to coffee the same way.
D．Because people feel guilty about drinking in the evening.
A．To indicate that one shouldn't be too greedy when investing.
B．To indicate that one should have no expectation when investing.
C．To indicate that one shouldn't count on continuous annual returns.
D．To indicate that one should keep an eye on the stormy weather.
A．They beat the smartest people when they work together.
B．They give kids an access to all of the world's knowledge.
C．They could only interest children in seventh grade.
D．They meet people's most basic needs all over the world.