单句改错。

1.  You should make yourself understand in English.____

2. The person was sent for would come here soon.____

3.  Not known what to do,he asked me for help.____

4.I am very glad to hear the news announcmg.____

5. Losing in thought,the old man was hit by a car.____

在下列脊髓灰质炎后遗症的临床表现中，哪项是错误的

A．皮肤感觉正常

B．行走时呈"剪刀步"步态

C．关节挛缩，形成多种畸形

D．肌肉萎缩呈迟缓性瘫痪

E．受累肢体骨骼生长发育迟缓