不属于印刷机械必须组成部分的是（）。
A、给纸部件
B、输水部件
C、输墨部件
D、印刷部件
E、收纸部件
参考答案：E
_______ after a long walk,Henry called and said he couldn't come to the meeting.[ ]
A. Having worn out
B. Being worn out
C. To wear out
D. Worn out
Some problems ___ in the lecture by Mr.Smith are very popular in our school, such as the waste of electricity, water and food, etc...
A．referring
B．referred to
C．referring to
D．were referred
