单项选择题

The______ cycle of life and death is a subject of interest to scientists and philosophers alike.

A．incompatible
B．exceeding
C．instantaneous
D．eternal
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单项选择题
The______ in my son's clothes are beginning to come apart.
A．seams
B．beams
C．rims
D．segments
单项选择题
These national parks are very important for preserving many animals, who would otherwise nm the risk of becoming______.
A．abolished
B．extinct
C．distinct
D．distinctive
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