句型转换。

1. This is his brother. (改为复数句子)

     ______ are their______ .

2. That girl is my sister. (改为一般疑问句)

     ______ that girl______ sister?

3. Those are my friends. (改为单数句子)

     ______ ______ my______.

4. They are English books. (改为单数句子)

     ______ is______ English______.

5. She is my grandmother. (改为否定旬)

    She______ my grandmother.

颅骨嗜酸性肉芽肿的特征性X线表现是（）

A.多累及额、顶骨，起于板障，渐累及内外板

B.病变破坏外板后可形成软组织肿块

C.病变边缘锐利或呈斜坡样，周边有轻度硬化

D.病变破坏区可跨越颅缝

E.“地图样”颅骨缺损，破坏区内可有"钮扣样"死骨