单项选择题

Which of the following best describes the relation of the first paragraph to the passage as a whole

A．It makes a general observation to be exemplified.
B．It outlines a process to be analyzed.
C．It poses a question to be answered.
D．It advances an argument to be disputed.

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单项选择题

The author implies that one way that VHS producers won control over the VCR market was by

A．carefully restricting access to VCR technology
B．giving up a slight early lead in VCR sales in order to improve long-term prospects
C．retaining a strict monopoly on the production of prerecorded videotapes
D．sharing control of the marketing of VHS-format VCR's

单项选择题

The passage is primarily concerned with which of the following

A．Evaluating two competing technologies
B．Tracing the impact of a new technology by narrating a sequence of events
C．Reinterpreting an event from contemporary business history
D．Illustrating a business strategy by means of a case history

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