(2013·江西，19)Marco Polo is said to have sailed on ________ Pacific Ocean on his way to Java in ________ thirteenth century.

A．the；a

B．a；/

C．/； the

D．the；the

位于琼中黎族售簏自治县的仙安石林是罕见的热带喀斯特地貌景观。