单项选择题

In his biography, the old scientist is described as a very ______ truth seeker.

A．infectious
B．prosperous
C．industrious
D．generous
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单项选择题
Seeing a snake ______ on the ground, the baby cried into tear.
A．gliding
B．skidding
C．slipping
D．prancing
单项选择题
To ensure maximal voter participation in a presidential election, thorough planning and a voter registration ______ are usually required.
A．collocation
B．investigation
C．drive
D．confinement
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