单项选择题

The boss's promise to increase the workers' pay was a ______ to union demands.

A．concession
B．recession
C．submission
D．commission
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单项选择题
Most scientists believe it is ______ to use animals in medical research.
A．legitimate
B．explicit
C．edible
D．illiterate
单项选择题
Thousands of people are needlessly ______ each year in road accidents.
A．smuggled
B．staggered
C．slaughtered
D．snatched
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