Questions 17 to 20 are based on the following passage.At the end of the passage, you will be given 20 seconds to answer the questions.
Now, listen to the passage. According to the passage, what will probably happen to the endangered species7A．They will gradually die out: B．They will be able to survive in the preserves. C．They will have to migrate to find new homes. D．They will face extinction without artificial reproduction.
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