______ that increasing numbers of compact-disc players will be bought by consumers in the years to come.

A．They are anticipated

B．In anticipation

C．Anticipating

D．It is anticipated

由于泻湖环境中，生物数量丰富，水体安静，有利于（）的堆积；泻湖底部常形成富含（）的还原环境，有利于（）的保存和向油气转化；因此泻湖相是很好的生油相带。