题目内容

With two children __ middle school in the nearby town now, the parents are working hard.

A. to attend
B. attending
C. attend
D. attended

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__ and short of breath, Andy and Ruby were the first to reach the top of the mountain.

A. to be tired
B. tired
C. tiring
D. being tired

There's a man at the reception desk who seems very angry and I think he means __ trouble.

A. make
B. to make
C. making
D. made

数字设备公司（DEC公司）在年首先研制出世界上第一台可编程序控制器，型号为，并在的自动生产线上试用成功。

可编程序控制器是一种装置，专为在工业环境下应用而设计。