问题
单项选择题 A1型题
下列关于杠杆的分类的描述不正确的是（）。
A.头颅与脊柱的连接是平衡杠杆
B.站立提踵时的跖趾关节是省力杠杆
C.人体中最为普遍的是省力杠杆
D.肘关节屈起前臂的动作是速度杠杆
E.运动锻炼不能增强肌力，而且能增大力臂来增加力矩
答案
参考答案：C
搜题请搜索小程序“爱下问搜题”
下列关于杠杆的分类的描述不正确的是（）。
A.头颅与脊柱的连接是平衡杠杆
B.站立提踵时的跖趾关节是省力杠杆
C.人体中最为普遍的是省力杠杆
D.肘关节屈起前臂的动作是速度杠杆
E.运动锻炼不能增强肌力，而且能增大力臂来增加力矩
参考答案：C
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| This little story I'm about to tell you happened when I was 11 years old, and I'll never forget it. It was at my friend Jenny's house after 1 one day, and we were doing our homework. While I was there, a friend of Jenny's mom came over to 2 I didn't know her name or 3 what her face looked like. I just 4 her hands, her voice and the lesson I 5 from her. I can't forget that she 6 her hands to introduce herself. It was so 7 , I thought, rich fine skin; then I heard her saying, "Oh no, that is not 8 you shake hands. Let me teach you." She didn't do that at all in a condescending (屈尊的) manner. 9 that, I just remember her voice explaining the 10 of a good handshake of conveying (传达) a 11 sense of self-belief, of looking the other person in the eyes, and of making a warm 12 . Hearing her friendly words, I first understand what being 13 meant. I admired her for 14 time to teach me about one of the important things in life. I was grateful for her not talking down to me 15 I was 11 and didn't know much. I also felt somewhat admired by the way she 16 me. It felt good to be talked to as a(n) 17 , rather than as an 11-year-old child. I also 18 her telling me that if someone isn't aware of something you should show him or her the right direction; don't be afraid to 19 your knowledge. I think of her every time I meet someone 20 , and I'm so thankful for her little lesson. | ||||
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