单项选择题

They were （） in their scientific research, not knowing what happened just outside their lab.

A．submerged
B．immersed
C．dipped
D．drowned

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单项选择题
If Japan （）its relation with that country, it will have to find another supplier of raw materials.

A．precludes
B．terminates
C．partitions
D．expires
单项选择题
When the farmers visited the city the first time, they were （）by its complicated traffic system.

A．evoked
B．bewildered
C．diverted
D．undermined
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