-I'm going on a trip to Yunnan after the exam.
-Really? ________!
A:Have a good time
B:Congratulations
C:OK
D:It's nice of you
函数y=﹣x,y=1x,y=﹣x2,y=2x+1,y=﹣12x中____ 表示y是x的反比例函数.
濒临灭绝的动物有:____、____、____、____、____等20种。