石油主要含有________、_________元素。石油的炼制是利用石油中各成分的________不同，将它们分离可得到多种产品，属于____变化，石油也是________物。

--- what do you think of store shopping in the future?

---- Personally, I think it will exist along with home shopping but___________.

A．will never replace

B．would never replace

C．will never be replaced

D．would never be replaced