单项选择题

Dr. Johnson ______ the task of writing a comprehensive English dictionary.

A．underwent
B．undertook
C．recreated
D．awarded
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单项选择题
______ market research has shown that most Americans prefer environmentally-friendly products.
A．Nasty
B．Neat
C．Preliminary
D．Prior
单项选择题
Some mushrooms are edible while others, which look almost identical, contain ______ poisons.
A．deadly
B．hasty
C．dizzy
D．gloomy
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