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
Building this road will（）the construction of ten bridges, and then the total cost reaches 1 million US dollars.

A. evolve
B. involve
C. revolve
D. devolve
单项选择题
It was clear that the storm ______ his arrival by two hours.
A. retarded
B. retired
C. refrained
D. retreated
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