Practically speaking, teaching as a profession is not as developed as law and medicine.

A．Raising the legal drinking age.
B．Banning alcohol consumption in public places.
C．Placing public health advertisements.
D．Raising taxes on alcoholic drinks.

A．Lack of advanced storing technology.
B．A need for joint efforts of scientists.
C．A shortage of practical support from the public.
D．An unreliable market demand.