(2014·甘肃金昌二中模拟)Hosting the 31st Olympics is________great honor and the Brazilians are working hard to make the games________success.

A．a；/　

B．/；a

C．a；a　

D．/；/

小层地层系数越大，小层压力对全井平均压力的影响（）。

A、越大

B、越小

C、越多

D、越少