The tiger, once a animal to humans, is now of disappearing on the earth.A. dangerous, dang

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A. dangerous, danger
(答案→)B. dangerous, in danger
C. in danger, in danger
D. danger, in danger
解析：考查danger的词性变化和短语。Dangerous是形容词“危险的”；in danger处于…危险中；句意：老虎，曾经对人类来说是一种危险的动物，现在正处于危险的情况之中。故B正确。