问题补充：
--Please the machine before you start it. Maybe it’s difficult for you to make it move.
--OK. I’ll try my best.
A. look up
B. look over
C. look for
D. look through
答案：
A. look up
(答案→)B. look over
C. look for
D. look through
解析：句意：在你发动机器前先检查机器，可能你很难使它移动。好的，我会尽力的。A. look up 在（字典、书等）中查找B. look over 仔细检查 C. look for寻找 D. look through浏览
故选B
