单项选择题

Some of the scientists assert that there is ______ UFO in the world.

A．no such thing as
B．no such thing as an
C．no such a thing as a
D．no such thing as a
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单项选择题
In a little more than 200 years, Australia has ______ some drastic social and economic changes.
A．taken
B．made
C．got
D．seen
单项选择题
Most people believe that the governmental departments should give ______ service at minimum cost.
A．best
B．most
C．utmost
D．maximum
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