There are fewer and fewer tigers in India. The situation will continue ______ humans stop hunting them for their fur and bones.
由下列实验事实或现象推出的结论中,正确的是( )
古代长颈鹿有颈长的和颈短的,我们现在看到的长颈鹿都是颈长的,长颈鹿的进化是( )
a=”2009”
b=”2008”
c=Val(a)+Val(b)