— I heard Henry had decided to turn art to business.

— Yes, he has great talent but he has lost his ______.[ ]

A. faith

B. failure

C. course

D. case

定期吸尘，将吸尘机换上专用的吸头，依次全面吸尘一次，是针对（）墙面清洁，保洁的做法。

A.木质

B.文化石

C.墙纸

D.紫铜饰面