Today, as the world's urban population explodes, and cities become more crowded, taller, and more crowded, America's total number of elevators—900,000 at last count, according to Elevator World magazine's “2017 Vertical Transportation Industry”—are a force that's becoming more important than ever. And for the people who really, really love them, it seems like high time that we looked seriously at just what kind of force they are.
67. What does the underlined word “this” in Paragraph 1 refer to?
A. The general view of elevators.
B. The particular interests of experts.
C. The desire for a remarkable machine.
D. The enthusiasm for transport vehicles.
68. The author's purpose in mentioning cars is ________.
A. to contrast their functions with elevators'
B. to emphasize the importance of elevators
C. to reveal their secret war against elevators
D. to explain people's preference for elevators
69. According to Prof Bernard, what has made the elevator ride different from other life experiences?
A. Vertical direction.
B. Lack of excitement.
C. Little physical space.
D. Uncomfortable conditions.
70. The author urges readers to consider ________.
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