单项选择题

Tim is dubious about diet pills which advertise quick weight loss.

A．anxious
B．pessimistic
C．doubtful
D．ignorant
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单项选择题
A pervasive negative attitude of the engineers toward projects funded by his company is the cause of the delay of signing the contract.
A．perpetual
B．pernicious
C．preventive
D．prevalent
单项选择题
In the early 20th century, at the advent of the telephone, it was considered a superfluous instrument which would never be of practical use in the average household.
A．appearance
B．popularity
C．dominance
D．consolidation
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