—Excuse me, Mr. Li,I don't know the meaning of the   whole sentence. What shall I do?  

—You'd better first____the new words.[ ]

A. look for                  

B. look up  

C. look through            

D. look down

手部皮肤护理程序的第一步是（）。

A.清洁手臂

B.准备工作

C.放松手臂

D.按摩