单项选择题

There are several theories as to why the dinosaurs become （）.

A．extinct
B．credible
C．distinct
D．esthetic

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单项选择题
By a strange（）the king was assassinated on the very spot where his grandfather had been killed.

A．coincidence
B．coherence
C．collaboration
D．conception
单项选择题
They were （） in their scientific research, not knowing what happened just outside their lab.

A．impaired
B．immersed
C．ignited
D．induced
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