A: Mum, I have finished my homework .____ .
B: Of course .Which is your favorite TV program ?
A: Sports .It is said there will be a wonderful football match on TV tonight .
B: ____ 
A: A Chinese team will play against a Japanese team .
B: ____ 
A: I'm not sure . Ball games are usually shown on Channel 8.
B: ____ 
A:Well , it must be on Channel 6 then . Try that .
B: Here it is .____  Let's watch it together .
A: That's all right.

当老师的年龄是学生这么大时，学生刚3岁；当学生是老师这么大时，老师39岁．老师今年（　　）岁．

如图是生殖发育有关的示意图，下列分析错误的是（　　）