How many planets are there in the solar system revolving around the sun

A．A literary critic.
B．A war correspondent.
C．A volunteer in the Spanish Civil War.
D．A novelist.

A．All TV sets can receive some programs without paying money in a certain area.
B．You may pay for some special programs if you like.
C．If you are interested in a certain subject, you may borrow some video tapes about it.
D．All of the above.