根据施工方法、施工条件及土石料性质的不同，坝面作业可分为( )几个主要工序。

A．覆盖层清除

B．铺料

C．整平

D．压实

E．质检

91. America is fond of carrying out hegemonism(霸权主义) all over the world. In the long run they will have to pay _____ price than September 11^th.

A．heavier

B．bigger

C．larger

D．weightier