单项选择题

The scientists began to accumulate a huge mass of data.

A．build up
B．put up
C．make up
D．clear up
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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
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
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