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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单项选择题
The______ of the interstate' s property has been agreed upon by the heirs.
A．dissolution
B．disposal
C．disappearance
D．disposition
单项选择题
Professor Smith' s new invention has created a great ______ on the campus.
A．sensation
B．selection
C．imitation
D．irrigation
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