小孙的口袋里有四颗糖,一颗巧克力味的,一颗苹果味的,两颗牛奶味的。小孙任意从口袋里取出两颗糖,他看了看后说,其中一颗是牛奶味的。问小孙取出的另一颗糖也是牛奶味的可能性(概率)是多少?( )
A、<img width="13" height="37" src="http://admintk.100xuexi.com/UpLoadImage/2016-08-19/24a73758-548b-4586-9280-48fa27a1722c.png" />
B、<img width="13" height="36" src="http://admintk.100xuexi.com/UpLoadImage/2016-08-19/c807c690-e385-4a59-b8ac-40fb91476f98.png" />
C、<img width="13" height="37" src="http://admintk.100xuexi.com/UpLoadImage/2016-08-19/4b00b4ea-07e1-441d-a2d2-e06db27db71c.png" />
D、<img width="13" height="37" src="http://admintk.100xuexi.com/UpLoadImage/2016-08-19/940cd686-7aeb-4d03-9339-567038d67edc.png" />
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