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
The boss's promise to increase the workers' pay was a（）to union demands.

A．concession
B．recession
C．submission
D．commission
单项选择题
Are you still （） that the climbers can be rescued

A．enthusiastic
B．optimistic
C．pessimistic
D．domestic
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