单项选择题
It is
estimated
that a scientific principle has
a life expectancy
of approximately a
decade
before
it drastically
revised or replaced by newer information.
A．estimated
B．a life expectancy
C．decade
D．it drastically
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单项选择题
Always since the creation of celluloid, plastics have been found to have a multitude of industrial and commercial uses.
A．Always
B．plastics
C．have
D．multitude
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单项选择题
The international Olympic Games, regarded as the world's most prestigious athletic competition, take place once every the four years.
A．regarded
B．prestigious
C．take place
D．every the four years
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