民如何变更民族成份？
参考答案：
变更民族成份的，由本人提出书面申请，民族工作部门出具证明，县区公安机关审批后办理。
根据句意及汉语提示完成句子。
1. The old man said he could not ____ ____ (依靠) his son all the time.
2. Different people wear different clothes on ____ ____ (特殊的日子).
3. There are some different shoes, ____ ____ (例如) sports shoes and boots here.
4. Today, people in the cities around the world wear rather _____ (相似的) clothes.
5. ____ ____ (据说) that the first type of clothes were made of animal skins. Do you think so?
苯丙酮尿症的遗传形式是（）
A.常染色体的显性遗传
B.多基因隐性遗传
C.X连锁显性遗传
D.X连锁隐性遗传
E.常染色体隐性遗传
