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
单项选择题
A noisy aggressive cousin of the crow, the magpie has those bird's thievish habits.
A．A noisy
B．aggressive
C．those
D．habits
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