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 letter said that there was an______, but I couldn' t find where it was.
A．emergency
B．exposure
C．enclosure
D．expenditure
单项选择题
Mary' s departure ______with Tom' s return.
A．complied
B．retarded
C．coincided
D．collaborated
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