单项选择题

Some concrete actions were taken to improve the living conditions there but proved to be __________.

A．at a premium
B．to no avail
C．of their own accord
D．on the alert
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单项选择题
It is universally acknowledged that Abraham Lincoln __________ the ideal of a great American president.
A．exemplified
B．traversed
C．reclaimed
D．necessitated
单项选择题
A careful biological experiment will __________ which factors are attributive to the plants' budding.
A．disperse
B．discern
C．dissipate
D．disregard
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