A．A person whose parents are clever.
B．A person who often thinks about difficult problems.
C．A person who is often helped by his parents and teachers.
D．A person who is born with a good brain and putting it into active use.

A．They are delighted because they can enjoy the scenery while driving.
B．They are frightened because traffic accidents are frequent.
C．They are irritated because the bridge is jammed with cars.
D．They are pleased because it saves them much time.