以十八烷基硅烷键合硅胶(ODS)为固定相、乙腈一水为流动相进行液相色谱分离的方法是( )。

A．离子抑制色谱法

B．离子对色谱法

C．反相色谱法

D．正相色谱法

E．吸附色谱法

______ that the way people spend their holidays has changed a great deal in the past ten years.

A．Which is reported

B．What is reported

C．As is reported

D．It is reported