—What do you think has brought great _____?

—_____ is the key to it.[ ]

A. successful; Hard work

B. success; Hard working

C. succeed; Work hard

D. success; Working hard

用硅橡胶类印模材料取二次印模，下面错误的是（）

A.高黏度硅橡胶放在托盘上，低黏度硅橡胶注射在需精确印模的牙体周围，托盘口内就位取终印模

B.用高黏度硅橡胶取初印模，再用小头注射器将低黏度硅橡胶注射在需精确印模的牙体周围取终印模

C.需要修整初印模

D.精确度高，龈下边缘取模精确

E.缺点是费时