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The number of _____ species increases e...

 The number of _____ species increases every year with their natural habitats disappearing.

A.dangerous

B.endangered

C.serious

D.harmful

 

B 【解析】考查单词意思,dangerous意思“危险的”, endangered意思“快要灭绝的”, serious意思“严肃的”, harmful意思“有害的”,根据意思,所以选B
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