学生训练时，倒立不稳，枕部触于垫上，出现双上肢麻木，活动无力，头稍歪向一侧，不敢转动。可能为何种损伤（）
A.环椎前脱位
B.环椎单侧半脱位
C.枢椎齿突基底部骨折
D.环椎后弓骨折
E.环椎后脱位
参考答案：B
解析：此题无其他检查，选择B只是一种可能性的估计，其他损伤也可出现此姿势，但由于B的情况必然出现此姿势，所以B的可能性最大。
Amanda is a very kind girl. She is 1 willing to help people who are in trouble. Now Amanda is 2 in the University of Texas. At the same 3 , she is volunteering to teach at Heart House in her free time. Heart House is a local after-school program for children. It 4 some extra classes for those children who are not doing well in their studies. Amanda goes to Heart House to teach the 5 twice a week. She has also set up a website for Heart House. 6 this way, more people will have more chances to learn about Heart House and help the children there. For Amanda volunteer work is not only good for 7 , but also good for her studies. “I feel happy to teach those children 8 to study. The happier thing is that I can also learn a lot from them,” Amanda says. Now, 9 Amanda’s website, every week each of the 125 volunteers helps the children at Heart House. “ 10 Amanda’s website, Heart House would not be able to have enough volunteers. She has supported our program a lot. We appreciate her help,” the program leader says.
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