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问题： 1．机器与机构的区别是什么？ 2．机器的生产过程包括哪些内容？

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He said he had ________ the performanceof the new model and was surprised at what he had seen then.

A. endeavored
B. demonstrated
C. witnessed
D. judged

Three people were killed in a head-on________ between a bus and a car.

A. collapse
B. collision
C. conflict
D. crush

This old school is still having of students it had a hundred years ago when it was first founded.

A. the sameamount...as
B. the sameamount...that
C. the samenumber...as
D. the samenumber...that

The doctor was _____ an operation tosave the patient's life.

A. acting
B. limiting
C. performing
D. assuming