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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单项选择题
There are several theories as to why the dinosaurs become ______.
A．extinct
B．credible
C．distinct
D．esthetic
单项选择题
The word effect (Line 1, Para. 1) is closest in meaning to ______ .
A．value
B．argument
C．strike
D．restraint
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