单项选择题

In the past, energy sources were thought to be ______, but it was not the case.

A．productive
B．transient
C．eternal
D．boundless
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单项选择题
Your choice of clothes is a ______ of your character, so you should take it seriously.
A．distinction
B．reflection
C．preservation
D．revelation
单项选择题
He ignored his parents' warnings of crazy driving and now he had to ______ the consequences of collision.
A．catch on
B．answer for
C．take on
D．settle down
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