单项选择题

Many biologists are critical of the film's ______premise that dinosaurs might one day return.

A．scientific
B．speculative
C．ambiguous
D．unwitting
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单项选择题
The Committee pronounced four members expelled for failure to provide information in the ______of investigations.
A．case
B．chase
C．cause
D．course
单项选择题
He had a clear ______of what was wrong with the machine and fixed it in a short time.
A．defect
B．dissertation
C．perception
D．persuasion
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