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
Sudden disastrous external stress such as in severe automobile accidents, airplane crashes, and underwater explosions may cause death through rupture of the major arteries.
A．impairment
B．severity
C．fracture
D．contraction
单项选择题
We must try to ______ the best of our moral values for our children and grand-children.
A．replace
B．remain
C．generate
D．preserve
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