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Verbal·Craft and Structure·Words in Context
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More than fifty years ago, caiman lizards were brought from the tropical wetlands of Latin America to the United States. Caimans now thrive in southern Florida, where they are negatively affecting native species, from crowding out alligators and crocodiles to preying on turtles and snakes that are already        to ongoing stressors like habitat loss.
Which choice completes the text with the most logical and precise word or phrase?
A
vulnerable
B
resistant
C
threatening
D
sympathetic