单项选择题

I was ______ in my reading, and didn't at first hear the doorbell ring.

A．immured
B．immersed
C．busy
D．infatuated
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单项选择题
Humans should not develop their economy at the ______ of the ecological environment.
A．destruction
B．pollution
C．expense
D．mercy
单项选择题
Such ______ as self-respect and industriousness merit the full backing of an employer.
A．advantages
B．traits
C．interests
D．shortcomings
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