单项选择题

The ______ indicator of this stage is the percentage of students who make the transition to college within 1 year of completing high school.

A．noticeable
B．visible
C．principal
D．perceptible
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单项选择题
What happened in that class probably reflects what is happening in society ______.
A．at large
B．at random
C．at first
D．at length
单项选择题
If you rub certain things together, their surfaces become ______ static electricity.
A．caught up with
B．charged with
C．kept up with
D．put up with
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