The number of ______ species decreases every year as natural habitats disappear.

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问题 The number of ______ species decreases every year as natural habitats disappear.

选项 A、dangerous
B、endangered
C、scarce
D、risky

答案B

解析 题意是:______物种的数量每年随自然栖息地的消失而减少。[B]endangered“濒危的”,符合题意。[A]dangerous“危险的”;[C]scarce“稀少的,不易找到的”,是表语形容词; [D]risky“危险的,冒险的”。因此,这三项都不符合题意。
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