How do the garter snakes deal with seasonal variations in temperature？
A. They grow an extra layer of skin in winter and shed it in summer.
B. They survive by migrating toward the south every winter.
C. They move into the limestone pits to escape winter temperatures.
D. They vary their food intake to maintain a constant body temperature.
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The word secretes in the passage is closest in meaning to
A. produces.
B. allows.
C. contains.
D. transforms.
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
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.
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