单项选择题

A scientific law is liable at anytime to need (); that is an eternal truth.

A. modifying
B. changing
C. revising
D. adjusting

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单项选择题
She () for a while and was unable to make a decision, so she asked for my help.

A. flickered
B. glittered
C. faltered
D. blinked
单项选择题
In recent years there has been a () increase in the cost of living; many families have to depend on the federal aids.

A. ponderous
B. powerful

C. significant
D. violent
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