单项选择题

His ______ behavior made everyone nervous. He was always rushing to open doors and perform other small tasks, apologizing unnecessarily for any inconvenience that he might have caused.

A．oblivious
B．observant
C．obsequious
D．obsolescent
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单项选择题
A computer usually has all the data it needs（）in its memory chips.

A、store
B、stores
C、stored
D、storing
单项选择题
Much of Asia is in hot climates ______ chicken and pork are much more popular than beef.
A．that
B．when
C．where
D．which
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