单项选择题

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

A．anxious
B．pessimistic
C．doubtful
D．ignorant
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单项选择题
We are totally unable, after decades of experiment, to replicate ancient glazed pottery.
A．produce
B．manufacture
C．dramatize
D．duplicate
单项选择题
The statement was an allusion to recent troubles with the agency's computers.
A．an explanation
B．a contradiction
C．a reference
D．a rejection
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