胸椎骨折脱位伴脊髓损伤患者，双下肢出现完全性瘫，这时的肌力是几级（）
A.0级
B.1级
C.2级
D.4级
E.5级
参考答案：A
解析：肌力分级：O级指肌力完全消失，无活动；1级指肌肉能收缩，关节不活动；2级指肌肉能收缩，关节稍有在水平面活动但不能对抗肢体重力；3级是指能对抗重力但不能对抗阻力；4级是指能对抗外来阻力使关节活动，但肌力较弱；5级指肌力正常。
Look at this picture. This is a photo 1 my family. There are 2 people in the picture. They are my 3 , my mother, my brother, my sister and me. My father 4 very happy every day. My mother is near my father. The __5 beside (在……旁边) my mother is my brother. He 6 play sports. The little girl near my mother is my 7 . 8 is very smart and cute. Everyone likes 9 very much. Who is 10 boy in the middle (在中间)? Ah! It is me. I love my family very much.
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