（）is a fact that English is being accepted as an international language.

A．serious writers would rather not use the word "Okay"
B．the word is invented by a political organization
C．the word is absolutely an American invention
D．the word was first used by the Indians

A．Some mountains in Siehuan Province.
B．A certain base in the city of Chengdu.
C．The Atlantic Zoo in the United States.
D．A separate room inside the panda hous