取高产奶牛的耳部细胞，经核移植、细胞培养、胚胎移植等过程，最终克隆出子代高产奶牛但是子代高产奶牛与提供耳部细胞的亲本高产奶牛的遗传性状却不完全相同．上述克隆过程可以说明（　　）

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    Helen is an English schoolgirl. She is now in Nanjing with her parents. She doesn't know Chinese. She often tries to speak Chinese to her Chinese friends. Sometimes they don't understand(理解) her, because she can't speak Chinese well.
    It's a Sunday morning. Helen wants to go to Zhongshan park. She is going there to see a flower show(展览). But she doesn't know how to go there. She asks a Chinese boy. The boy can't understand her. Then she takes out a pen and some paper. She draws a park and some flowers on it and gives the picture to the boy and says something about it. The boy smiles and then shows Helen the way to the park.

在我国北京周口店发现的北京猿人属于  （    ）

秦岭-淮河一线是我国一条重要的地理分界线。

如图，直线AB、CD相交于点O，∠DOE=∠AOD，OF平分∠BOE，如果∠BOC=35°，那么∠EOF是多少度？