单项选择题

According to the author, which is NOT the designer's chief concern when he designs a product

A．Stress factors.
B．Man-hours.
C．Disapproving.
D．Customer-appeal.
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单项选择题
The average number of hours of sleep that an adult needs is ______.
A．approximately six hours
B．around ten hours
C．about eight hours
D．not stated here
单项选择题
Which of the following statements best describes the organization of the pas- sage
A．A statement illustrated by an analogy(类比).
B．A hypothesis supported by documentation(引用文献).
C．A comparison of two contrasting theories.
D．A critical analysis of a common assumption.
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