The bad weather is reported _______ the passenger plane crash in Iran on January 9.

A．to contribute to

B．contributing to

C．contributed to

D．to have contributed to

以N_A表示阿伏加德罗常数，下列说法中正确的是

A．将1.0molFeCl₃全部制成胶体，其中氢氧化铁胶粒为N_A个

B． 0.1molOH^－含N_A个电子

C．1.8g重水（D₂O）中含N_A个中子

D．标准状况下11.2L臭氧中含N_A个氧原子