单项选择题

The automatic doors in supermarkets _______ the entry and exit of customers with shopping carts.

A．allocate
B．facilitate
C．induce
D．furnish
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单项选择题
At last they _______ three figures moving in the distance.
A．turned out
B．made out
C．worked out
D．found out
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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