第18题: [单项选择]What does the man do in the holidays A. Stay with his parents. B. Have a further education. C. Take a part-time jo 参考答案:C 答案解析:[听力原文] 12-14 M: Excuse me, are you a college student W: Yes, I am. What about you M: Me,
第19题: [单项选择]一个步行周期是指 A. 从一侧下肢着地到另一侧下肢着地为止所走的距离 B. 从一侧足跟着地到该侧足跟再次着地为止所走的距离 C. 从一侧足跟着地到另一侧足跟再次着地为止所走的距离 D. 从一侧足跟着地到另一侧足跟着地为止所走的距离 E. 从一侧下肢着地到另一侧下肢着地为止所用的时间 参考答案:B 答案解析:从一侧足跟着地到该侧足跟再次着地为止所走的距离,这恰为一个步行周期。