单项选择题

It was an allusion to what the scientist thought was an inappropriate distribution of funds for stem cell research.

A．reference
B．contradiction
C．explanation
D．rejection
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单项选择题
Tim is dubious about diet pills which advertise quick weight loss.
A．anxious
B．pessimistic
C．doubtful
D．ignorant
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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