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
When Jack eventually overtook the last track he pulled over to the inside lane.
A．skipped
B．passed
C．reached
D．led
单项选择题
Because of the popularity of the region, it is advisable to book hotels in advance.
A．possible
B．profitable
C．easy
D．wise
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