夷门监者侯嬴，年七十余，好奇计。秦伐赵急，魏王使晋鄙救赵，畏秦，戒勿战。平原君以书责信陵君，信陵君欲约客赴秦军，与赵俱死，谋之侯生，生乃屏人语曰：“嬴闻晋鄙兵符在王卧内，而如姬最幸，力能窃之。昔如姬父为人所杀，公子使客斩其仇头进如姬，如姬欲为公子死无所辞，顾未有路耳。公子诚一开口，如姬必许诺，则得虎符。夺晋鄙军，北救赵而西却秦，此五霸之功也。”公子从其计，请如姬。如姬果盗符与公子。

    公子行，侯生曰：“将在外，主令有所不受。公子即合符，而晋鄙不授公子兵而复请之，事必危矣。臣客屠者朱亥可与俱，此人力士。晋鄙听，大善；不听，可使击之。”于是公子请朱亥，朱亥笑曰：“臣乃市井鼓刀屠者，而公子亲数存之。所以不报谢者，以为小礼无所用。今公子有急，此乃臣效命之秋也。”遂与公子俱。公子至邺，矫魏王令代晋鄙兵，晋鄙合符，果疑之，欲无听。朱亥袖四十斤铁椎椎杀晋鄙。

    公子遂将晋鄙兵进，大破秦军。

（选自冯梦龙《智囊·侯嬴》）

 词语填空通读下面的短文， 掌握其大意，然后从各题所给的A,B,C三个选项中选出最佳答案

I am not a brave girl, and even a little mouse scares(惊吓) me.1 I’ve been crazy about bungee jumping(蹦极). One day, I found a good place for this exicing2in Thailand by surfing the Internet. I packed my bag and flew there. However, I had no idea how to get to the address listed on the3. I called them and took a taxi, but the taxi driver didn’t know the way, either. He dropped me halfway.

Having bought some bread, I had to wait for the car that was supposed to pick me up. Just then a young man jumped out of a car and asked if I was Jenny. Then we 4 to the bungee jumping place. I was amazed by the sights along the road through the window of the car.

I quickly signed an agreement which said I I might die, and5 a harness(安全带). The guide led me through a gate, asked me to sit in a special seat and tied my 6and ankles(踝) well。

I was nervous but not scared. As soon as I stood up and felt my ankles7together, I got scared, I walked slowly to the edge(边) of the bridge and looked back. The workers looked at me and couldn't help laughing. At last it was time to go. So I jumped as 8forward as I could.

  At that moment my memory seemed to stop. I felt 9 going up, like riding a fast lift, and them another drop and… Finally, I stopped in the air. I spread my arms wide, laughing loudly and 10. The workers pulled me up, smiling at me.

当你发现显微镜镜头不干净时，除去污物的正确方法是（　　）

根据短文理解，选择正确答案。

如图，量得∠1＝80°，∠2＝100°，可以判定AB∥CD，它的根据是什么？