It can’t be denied that the Diaoyu Islands are ________ part of China and what some Japanese have done recently is actually ________ offence against Chinese people.

A．a; /

B．a; the

C．the; /

D．/; an

下列符号表示一种元素的是（　　）

A．CO

B．C

C．CO₂

D．C₆₀