Both parents and teenagers should try their best to communicate more with each other and _____ the gap

between them. [ ]

A. open

B. adjust

C. narrow

D. reduce

下列哪项不是骨纤维结构不良的X线表现（）

A.骨皮质膨胀，无骨膜反应

B.颅骨硬化及颅底畸形

C.骨干囊状透亮区，呈磨砂玻璃状

D.骨骺延迟闭合，无病理骨折

E.病变呈多房状