-Have you got any idea for the summer vacation?

-I don’t mind where we go        there’s sun,sea and beach. [ ]

A.as if

B.as long as

C.now that

D.in order that

计算题：经测量，CA6102型发动机的气缸最小磨损处直径为101.95mm，并通过计算用第四级修理尺寸（+1.00mm），活塞最大尺寸为102.6mm，若气缸配合间隙为0.035mm，磨缸余量留0.05mm，求其镗削量。