患儿，女性，5岁，因右下肢跛行3年而入院。患儿2岁方学会走路，当时被发现右下肢行走不稳，升降步态，无外伤史。体检：体温36.5℃，右下肢无红肿、无压痛，下肢肌力正常，皮肤感觉正常，右髋关节屈伸正常，外展稍受限，其余关节活动正常。
关于CDH的症状和体征，下述哪些是正确的（）。
A.Ortolalu试验常被用作3岁以上患儿的检查
B.AlliS征被认为是CDH的特异体征
C.套叠试验往往阳性
D.Trendelenburg试验阳性即指一足站立，另一下肢抬起，下肢抬起侧臀部下沉，说明臀部下沉侧臀中肌的功能不全
E.单侧髋脱位时呈摇摆步态
F.臀纹和大腿皮纹不对称，股三角空虚，会阴部增宽
G.AlliS征只适用于单侧发病
参考答案：C, F, G
The concept of homeschooling is not a new one. Homeschooling means educating children at home instead of sending them to public or private schools. Nowadays, homeschooling has become popular in many countries for a variety of reasons. One of them is poor quality of education in public schools and it’s also because private schools are quite expensive. Some parents believe that because they know their child’s strengths and weaknesses, they can teach him or her better. Some parents prefer homeschooling so as to prevent their children from getting into bad company. There is another group of people who choose to educate their children at home because they want them to learn spirit and values of the family and also their religious beliefs. They also think that homeschooling would help in development of strong family bonds(家庭纽带). However, there are some negative effects of homeschooling on students as well as parents. Homeschooling is a full-time job and not fit for parents who have their own careers. It takes a lot of time for parents’ side to make homeschooling a success. Other family members’ responsibilities may also be affected. They may give their full attention to the needs of their children. Besides, a parent may have high educational qualifications, but that does not make him or her a good teacher. Teaching is an art, which requires the ability to understand the needs of the children. It is likely that the parent might have forgotten what he or she has learned, and the curriculum(课程) of the children would also be different. This would make it difficult for the parents to explain the concepts to their children. Parents also have the responsibility of designing the curriculum of students. In today’s world, competition(比赛) is seen in every field, and school prepares children to face these competitions. However, homeschooling does not give the children a chance to compare with other kids. They will also not be aware of where they stand in educational position among their classmates. This may affect their future lives. Education is not the only thing that the children need to become successful human beings. It is necessary that they learn to communicate in the society, and public school provides them with such an environment, where they meet many people. Schools also provide children with a chance to take part in various activities to improve their overall development. It is true that it has many benefits, but one must realize that school teaches children skills to face and survive. Homeschooling
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