In Para. 3, in addition to the advantages of no need to carry cash and being useful in emergencies, what else is said to be the advantage of credit cards

A．Because it gives people a sense of achievement.
B．Because most people like doing it every day.
C．Because it is neither biochemical nor poisonous.
D．Because it increases the heart rate and circulation.

A．He was surely under huge pressure.
B．The caf6 was not one of his greatest achievements.
C．He did almost nothing significant.
D．He was the greatest leader of the students’ union.