题目内容

I often get ______ after doing a lot of housework.

A. tired
B. tiring
C. to tire
D. tires

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Collecting stamps ______ my favorite when I was young.

A. are
B. is
C. were
D. was

Once computers ______ how to do it, they will do many things for us.

A. tell
B. told
C. are told
D. are telling

Generally speaking, I prefer mineral water _____ tea.

A. to
B. for
C. with
D. from

试画出开环控制系统与闭环控制系统框图，并比较开环控制系统和闭环控制系统的优缺点。