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

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单项选择题
The judge remained sober despite the lawyer's ludicrous attempt to prove the defendant's innocence.（）

A. sad
B. sorry
C. serious
D. surprised
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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