单项选择题

______ market research has shown that most Americans prefer environmentally-friendly products.

A．Nasty
B．Neat
C．Preliminary
D．Prior
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单项选择题
Mary Shelley was just 18 when she wrote the horror ______ 'Frankenstein'.
A．episode
B．ethics
C．doctrine
D．masterpiece
单项选择题
This fever will return from time to time, if it follows its usual ______.
A．pattern
B．model
C．mode
D．norm
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