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
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
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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