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题目内容
（河北农业大学大学英语Ⅳ）
Because of over-hunting, the number of certain types of whales has been reduced so greatly that they are in danger of becoming ________.
A、
flourish
B、
executive
C、
security
D、
extinct
A、
flourish
B、
executive
C、
security
D、
extinct
参考答案