It is known to all that ________ People’s Republic of China is ________ biggest developing country in the world.

A．the; /

B．/; the

C．the; the

D．/; /

久居高原的人血液中比在平原生活的人多的可能是（　　）

A．红细胞

B．白细胞

C．血小板

D．血浆