单项选择题

Data from Voyager Ⅱ have presented astronomers with a puzzle about why our outermost planet exists.

A．problem
B．mystery
C．question
D．point
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单项选择题
The latest census suggests that the population is declining in this country.
A．count
B．statement
C．agreement
D．estimate
单项选择题
The film originated from a short story.
A．resulted
B．heard
C．derived
D．made
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