Listen again to part of the lecture．Then answer the question. Why does the professor say this:
A. To describe the shape of the arch
B. To define the concept of lateral thrust
C. To compare two types of physical force
D. To explain why arches must be large
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Which of the sentences below best expresses the essential information in the highlighted sentence in the passage？ Incorrect choices change the meaning in important ways or leave out essential information.
A. The lack of variety and short life of film reels prevented the industry from experiencing real success.
B. In order to attract larger audiences to their showings, exhibitors needed to expand their stocks of films.
C. Due to difficulties transporting the films long distances, traveling cinemas were not commercially successful.
D. The public soon began demanding higher-quality films, but most exhibitors were unable to obtain them.
According to the professor, why are arches that are built today mostly decorative in function？
A. Wedge-shaped blocks have become rare.
B. Decorative arches provide work for bricklayers.
C. Few architects like ancient construction techniques.
D. Wide openings are now spanned with steel beams.
What will the professor probably include in the form. that he fills out？
A. The student's examination scores
B. Slides of the student's artwork
C. A copy of the student's employment history
D. A description of the student's research report
What’s the strike union made up of？
Ambulance staff and dentists.
B. Surgeons and family doctors.
C. All of the above.
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