解颅是指：
A．囟门下陷
B．囟门高突
C．囟门迟闭
D．头形过小
E．头面肿胀
参考答案：C
Tom likes doing things with his family. He’s learned much from ___ His family help him a lot.
A．it
B．them
C．he
D．they
脑血栓形成的最常见原因是（）
A.高血压
B.动脉粥样硬化
C.各种脑动脉炎
D.血压偏低
E.红细胞增多症
