已知$m,n$为异面直线，$m\subset \alpha ,n\subset \beta$，$\alpha \cap \beta =l$，则直线l（   ）

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    晋侯、秦伯围郑，以其无礼于晋，且贰于楚也。晋军函陵，秦军氾南。佚之狐言于郑伯曰：“国危矣，若使烛之武见秦君，师必退。”公从之。辞曰：“臣之壮也，犹不如人；今老矣，无能为也已。”公曰：“吾不能早用子，今急而求子，是寡人之过也。然郑亡，子亦有不利焉！”许之，夜缒而出。见秦伯，曰：“秦、晋围郑，郑既知亡矣。若亡郑而有益于君，敢以烦执事。越国以鄙远，君知其难也，焉用亡郑以陪邻？邻之厚，君之薄也。若舍郑以为东道主，行李之往来，共其乏困，君亦无所害。且君尝为晋君赐矣，许君焦、瑕，朝济而夕设版焉，君之所知也。夫晋，何厌之有？既东封郑，又欲肆其西封，若不阙秦，将焉取之？阙秦以利晋，唯君图之。”秦伯说，与郑人盟。使杞子、逢孙、杨孙戍之，乃还。

Sunshine Zoo is a nice place to visit. Walk from the South Gate, go  1 , and you will find the Panda House. Pandas are  2  . They like eating   3  . To the north of the Panda House, you'll find the   4. They are the kings of the animal world. Remember not to go near them because they are  5. To the west of  6 Area, you will see lots of birds. They can make beautiful sounds. Go on and you will see the clever and  7 monkeys. To the east of the Monkeys' Forest, you will see the giraffes. The giraffe has a long   8 . It is the tallest animal on the earth(地球). To the north-east of the giraffes, there is a  9  . Cross it, and you will see the elephants. Their ears are 10 open fans.