If ~$m$~ is an even integer, ~$v $~ is an odd integer, and ~$m$~ >~$v $~>0, which of the following represents the number of even integer less than m and greater than ~$v $~?
~$\frac{m-v}{2}-1$~
~$\frac{m-v-1}{2}$~
~$\frac{m-v}{2}$~
~$m-v-1 $~
~$m $~-~$v $~
同认为答案是D
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