题目

 完形填空 阅读下面短文,从下列各题所给的A、B、C、三个选项,选出可以填入空白处的最佳答案。     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 exiting   2   in 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 the   3  . I called them and took a taxi, but the taxi driver didn’t know the way, either. He dropped me halfway.     Having bought so如图为一攀岩运动员正沿竖直岩壁缓慢攀登,由于身背较重的行囊,重心上移至肩部的0点,总质量为60kg.此时手臂与身体垂直,手臂与岩壁夹角为53°.则手受到的拉力和脚受到的作用力分别为(设手、脚受到的作用力均通过重心O,g取10m/s2,sin53°=0.8,cos53°=0.6)( )A.450N  800NB.480N  360NC.360N  480ND.800N  450N
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